Diagnostic Features (diagnostic + feature)

Distribution by Scientific Domains
Distribution within Medical Sciences


Selected Abstracts


Atrial Fibrillation Burden During the Post-Implant Period After CRT Using Device-Based Diagnostics

JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 8 2006
BURKHARD HÜGL M.D.
Aims: Cardiac resynchronization therapy (CRT) is increasingly used in congestive heart failure (CHF) patients (with cardiac dyssynchrony). In addition to delivering therapy, CRT devices offer a variety of diagnostic tools for continuous long-term monitoring of clinically relevant information (i.e., occurrence and duration of arrhythmia episodes). Methods and Results: Eighty-four patients with drug-refractory CHF in NYHA-class II,IV received a CRT device. The response to CRT was assessed by determining NYHA class at baseline and at 3 months follow-up. Atrial fibrillation (AF) burden (defined as time of AF per day) was continuously measured by the device. A significant gradual reduction of AF burden (from 9.88 ± 12.61 to 4.20 ± 9.24 [hours/day]) and number of patients experiencing AF episodes (from 26 to 13) were observed during CRT. Conclusions: (1) Diagnostic features for long-term monitoring of physiological variables provide useful information on the state and course of AF and may improve disease management. (2) AF burden reduces over time during the first 3 months after CRT implantation. [source]


Evolution of the nose and nasal skeleton in primates

EVOLUTIONARY ANTHROPOLOGY, Issue 4 2007
Timothy D. Smith
Abstract One traditional diagnostic feature of the Order Primates is a decreased emphasis on olfaction.1, 2 Some authors attribute this feature only to tarsiers and anthropoids, either through convergence or as a common feature of haplorhines.2,4 Other authors de-emphasize olfaction relative to vision,5,7 which does not necessarily denote olfactory reduction per se. There are lengthy roots to this discussion. The importance of the sense of smell to at least some primates, humans in particular, has long been viewed as secondary to the importance of visual, auditory, and tactile senses. Smell, or olfaction, is viewed as the primitive special sense, the stimuli perceived in an unconscious manner, submerged relative to higher neural functions,1 and a sense that has been increasingly reduced during the course of primate evolution.1,8 Anatomical structures related to olfaction differ profoundly in proportions and complexity between higher taxonomic groups of primates (Haplorhini, Strepsirrhini). These anatomical differences are beyond dispute (Box 1). However, the relationship between the anatomical differences and primate sensory abilities, and hence the validity of using them to group primates into "microsmatic" or "macrosmatic" categories,9, 10 is less clear when we examine the physiological and genetic data on primate olfaction. [source]


Stepwise proteolytic removal of the , subdomain in ,-lactalbumin

FEBS JOURNAL, Issue 15 2001
The protein remains folded, can form the molten globule in acid solution
Bovine ,-lactalbumin (,-LA) is an ,/, protein which adopts partly folded states when dissolved at low pH (A-state), by removal of the protein-bound calcium at neutral pH and low salt concentration (apo-state), as well as in aqueous trifluoroethanol. Previous spectroscopic studies have indicated that the A-state of ,-LA at pH 2.0, considered a prototype molten globule, has a native-like fold in which the helical core is mostly retained, while the , subdomain is less structured. Here, we investigate the conformational features of three derivatives of ,-LA characterized by a single peptide bond fission or a deletion of 12 or 19/22 amino-acid residues of the , subdomain of the native protein (approximately from residue 34 to 57). These ,-LA derivatives were obtained by limited proteolysis of the protein in its partly folded state(s). A nicked ,-LA species consisting of fragments 1-,3,40 and 41,123 (nicked-LA) was prepared by thermolytic digestion of the 123-residue chain of ,-LA in 50% (v/v) aqueous trifluoroethanol. Two truncated or gapped protein species given by fragments 1,40 and 53,123 (des,1-LA) or fragments 1,34 and 54-,57,123 (des,2-LA) were obtained by digestion of ,-LA with pepsin in acid or with proteinase K at neutral pH in its apo-state, respectively. The two protein fragments of nicked or gapped ,-LA are covalently linked by the four disulfide bridges of the native protein. CD measurements revealed that, in aqueous solution at neutral pH and in the presence of calcium, the three protein species maintain the helical secondary structure of intact ,-LA, while the tertiary structure is strongly affected by the proteolytic cleavages of the chain. Temperature effects of CD signals in the far- and near-UV region reveal a much more labile tertiary structure in the ,-LA derivatives, while the secondary structure is mostly retained even upon heating. In acid solution at pH 2.0, the three ,-LA variants adopt a conformational state essentially identical to the molten globule displayed by intact ,-LA, as demonstrated by CD measurements. Moreover, they bind strongly the fluorescent dye 8-anilinonaphthalene-1-sulfonate, which is considered a diagnostic feature of the molten globule of proteins. Therefore, the , subdomain can be removed from the ,-LA molecule without impairing the capability of the rest of the chain to adopt a molten globule state. The results of this protein dissection study provide direct experimental evidence that in the ,-LA molten globule only the , domain is structured. [source]


Should amenorrhea be a diagnostic criterion for anorexia nervosa?

INTERNATIONAL JOURNAL OF EATING DISORDERS, Issue 7 2009
Evelyn Attia MD
Abstract Objective: The removal of the amenorrhea criterion for anorexia nervosa (AN) is being considered for the fifth edition of The Diagnostic and Statistical Manual (DSM-V). This article presents and discusses the arguments for maintaining as well as those for removing the criterion. Method: The psychological and biological literatures on the utility of amenorrhea as a distinguishing diagnostic criterion for AN and as an indicator of illness severity are reviewed. Results: The findings suggest that the majority of differences among patients with AN who do and do not meet the amenorrhea criterion appear largely to reflect nutritional status. Overall, the two groups have few psychological differences. There are mixed findings regarding biological differences between those with AN who do and do not menstruate and the relationship between amenorrhea and bone health among patients with AN. Discussion: Based on these findings, one option is to describe amenorrhea in DSM-V as a frequent occurrence among individuals with AN that may provide important information about clinical severity, but should not be maintained as a core diagnostic feature. The possibilities of retaining the criterion or eliminating it altogether are discussed. © 2009 American Psychiatric Association. Int J Eat Disord 2009 [source]


Molecular aspects of diagnostic nucleolar and nuclear envelope changes in prostate cancer

JOURNAL OF CELLULAR BIOCHEMISTRY, Issue 1 2004
Andrew H. Fischer
Abstract Prostate cancer is still diagnosed by pathologists based on subjective assessment of altered cell and tissue structure. The cellular-level structural changes diagnostic of some forms of cancer are known to be induced by cancer genes, but the relation between specific cellular-level structural features and cancer genes has not been explored in the prostate. Two important cell structural changes in prostate cancer,nucleolar enlargement and nuclear envelope (NE) irregularity,are discussed from the perspective that they should also relate to the function of the genes active in prostate cancer. Enlargement of the nucleolus is the key diagnostic feature of high-grade prostatic intraepithelial neoplasia (PIN), an early stage that appears to be the precursor to the majority of invasive prostate cancers. Nucleolar enlargement classically is associated with increased ribosome production, and production of new ribosomes appears essential for cell-cycle progression. Several cancer genes implicated in PIN are known (in other cell types) to augment ribosome production, including c-Myc, p27, retinoblastoma, p53, and growth factors that impact on ERK signaling. However, critical review of the available information suggests that increased ribosome production per se may be insufficient to explain nucleolar enlargement in PIN, and other newer functions of nucleoli may therefore need to be invoked. NE irregularity develops later in the clonal evolution of some prostate cancers, and it has adverse prognostic significance. Nuclear irregularity has recently been shown to develop dynamically during interphase following oncogene expression, without a requirement for post-mitotic NE reassembly. NE irregularity characteristic of some aggressive prostate cancers could reflect cytoskeletal forces exerted on the NE during active cell locomotion. NE irregularity could also promote chromosomal instability because it leads to chromosomal asymmetry in metaphase. Finally, NE irregularity could impact replication competence, transcriptional programming and nuclear pore function. © 2003 Wiley-Liss, Inc. [source]


Reduced genital sensitivity in female patients with multiple system atrophy of parkinsonian type

MOVEMENT DISORDERS, Issue 4 2003
Wolfgang H. Oertel MD
Abstract According to the consensus statement on the diagnosis of multiple system atrophy (MSA), erectile dysfunction is required for male patients to fulfil the urinary incontinence criterion. However, there is no equivalent item for female patients. We questioned 19 female patients with MSA of the parkinsonian type (MSA-P), 28 female patients with Parkinson's disease (PD), and 27 healthy controls on their genital sensitivity. A total of 47% of the MSA patients but only 4% of the PD patients and 4% of the control group admitted to reduced genital sensitivity, a highly significant difference (P < 0.001). Moreover, the appearance of reduced genital sensitivity in female MSA patients showed a close temporal relation to the onset of the disease. If these preliminary results can be confirmed and further specified in a larger sample, a historical item of reduced genital sensitivity in female patients might become a diagnostic feature for MSA, comparable to erectile dysfunction in male patients. © 2002 Movement Disorder Society [source]


Three-dimensional seismic characterisation of large-scale sandstone intrusions in the lower Palaeogene of the North Sea: completely injected vs. in situ remobilised sandbodies

BASIN RESEARCH, Issue 4 2010
Ewa Szarawarska
ABSTRACT A large number of km-scale, saucer-shaped sandstone bodies of enigmatic origin have recently been documented in the North Sea and the Faroe Shetland Basin. This study utilises three-dimensional seismic data, calibrated by well data, to examine two such bodies that exhibit very similar saucer-shaped geometries in cross-section. The Volund and Danica structures, located 250 km apart are interpreted as end members of a spectrum of large-scale remobilised and injected sandstones present in the North Sea Palaeogene. Both are characterised by a central 1,2 km-wide low area surrounded by a discordant, 2,300 m tall inclined dyke complex, that tips out into a bedding concordant body interpreted as a shallow-level sill and/or partly extruded sandstone. The origin of the central concordant sandstone body as either injected (laccolith) or depositional is of key importance to a complete understanding of the origin and prospectivity of these structures. The key criteria for recognising an injected vs. depositional origin for the central concordant sandbody are: (1) a flat, nonerosional base; (2) ,jack-up' of the overburden equal to the underlying sand thickness; (3) equally thick layers of encasing mudstones; and (4) paleogeographic context. This study suggests that the Danica structure was deposited as a channel sandstone and remobilised in situ; this led to the formation of wing-like intrusions along the channel margins. In contrast, the Volund structure overburden displays a forced-fold geometry, arguably a diagnostic feature of an intrusive origin. The ability to recognise and differentiate completely injected vs. in situ remobilised sandbodies is important both from a basin analysis, hydrocarbon exploration and rock mechanics points of view. An improved understanding of these aspects will lead to a reduction of risks associated with the exploration and development of such a sandbody and an enhanced understanding of sediment remobilisation and fluid flow on a basin scale. [source]


Fine-needle aspiration of brown tumor of bone: Cytologic features with radiologic and histologic correlation

DIAGNOSTIC CYTOPATHOLOGY, Issue 2 2009
Ph.D., Sasha Pavlovic M.D.
Abstract We report the case of a 40-year-old man with tertiary hyperparathyroidism due to end stage renal disease who initially presented with acute-onset paraplegia, elevated serum parathyroid hormone, and multiple bone abnormalities, including a large extradural intraspinal mass seen by magnetic resonance imaging. In contrast with imaging features, fine-needle aspiration cytology showed numerous benign-appearing multinucleated osteoclast-type giant cells that are the characteristics of either brown tumor or benign giant cell tumor of bone. Sheets of mononuclear spindled stromal cells were also noted. A core-needle biopsy confirmed the diagnostic features of brown tumor of hyperparathyroidism. Diagn. Cytopathol. 2009. © 2008 Wiley-Liss, Inc. [source]


Differential diagnostic features of small cell carcinoma in the uterine cervix

DIAGNOSTIC CYTOPATHOLOGY, Issue 9 2008
Min Jung Kim M.D.
Abstract Small cell carcinoma (SMCC) of the uterine cervix is rare and known to be an aggressive tumor, but there are only few reports on the cytologic features of cervical SMCC. This rare small cell lesion should be distinguished from malignant lymphoma (ML), squamous cell carcinoma in situ (SCIS), and chronic lymphocytic cervicitis (CLC). By clarifying cytologic features and reevaluating the significance of cervical cytologic smears to reveal these cervical lesions, we can improve the diagnostic specificity and patient's outcome. The clinical record and available cervical smears from 13 cases of SMCC, four cases of malignant lymphoma, 20 cases of SCIS, and five cases of CLC were analyzed. The cytologic differential diagnostic points of SMCC were nuclear molding and smearing (100%), salt and pepper chromatin (100%), exudative and necrotic background (91.7%), various architectures including individual cells (83.3%), tight clusters (75%) and feathering and strip (50%), and inconspicuous nucleoli (75%). Early diagnosis of the cervical SMCC by cytology and treatment is important for better outcome of patients. Diagn. Cytopathol. 2008;36:618,623. © 2008 Wiley-Liss, Inc. [source]


A single question for the rapid screening of restless legs syndrome in the neurological clinical practice

EUROPEAN JOURNAL OF NEUROLOGY, Issue 9 2007
R. Ferri
The purposes of this study were to validate the use of a single standard question for the rapid screening of restless legs syndrome (RLS) and to analyze the eventual effects of the presence of RLS on self-assessed daytime sleepiness, global clinical severity and cognitive functioning. We evaluated a group of 521 consecutive patients who accessed our neurology clinic for different reasons. Beside the answer to the single question and age, sex, and clinical diagnosis, the following items were collected from all patients and normal controls: the four criteria for RLS, the Epworth Sleepiness Scale (ESS), the Clinical Global Impression of Severity (CGI-S), and the Mini-Mental State evaluation. RLS was found in 112 patients (70 idiopathic). The single question had 100% sensitivity and 96.8% specificity for the diagnosis of RLS. ESS and CGI-S were significantly higher in both RLS patient groups than in normal controls. RLS severity was significantly higher in idiopathic than in associated/symptomatic RLS patients. RLS can be screened with high sensitivity and good reliability in large patient groups by means of the single question; however, the final diagnosis should always be confirmed by the diagnostic features of RLS and accompanied by a careful search for comorbid conditions. [source]


Expression of muscle-related genes and two MyoD genes during amphioxus notochord development

EVOLUTION AND DEVELOPMENT, Issue 5 2003
Aki Urano
Summary The notochord is one of the diagnostic features of the phylum Chordata. Despite the similarities in the early morphogenetic patterns of the notochords of various chordates, they are strikingly distinct from one another at the histological level. The amphioxus notochord is one example of an evolutionary novelty because it is made up of muscle cells. Our previous expressed sequence tag analysis, targeting messenger RNAs expressed in the adult amphioxus notochord, demonstrated that many muscle-related genes are expressed there. To characterize amphioxus notochord cells and to gain insights into the myogenic program in the notochord, we determined the spatial and temporal expre-ssion patterns of these muscle-related genes during amphioxus development. We found that BbNA1 (notochord actin), Amphi-Trop I (troponin I), Amphi-TPmyosin (tropo-myosin), Amphi-MHC2 (myosin heavy chain), Amphi-nMRLC (notochord-specific myosin regulatory light chain), Amphi-nTitin/MLCK (notochord-specific titin/myosin light chain kinase), Amphi-MLP/CRP3 (muscle LIM protein), and Amphi-nCalponin (notochord-specific calponin) are expres-sed with characteristic patterns in notochord cells, including the central cells, dorsally located cells, and ventrally located cells, suggesting that each notochord cell has a unique molecular architecture that may reflect its function. In addition, we characterized two MyoD genes (Amphi-MyoD1 and Amphi-MyoD2) to gain insight into the genetic circuitry governing the formation of the notochord muscle. One of the MyoD genes (Amphi-MyoD2) is expressed in the central notochord cells, and the coexistence of Amphi-MyoD2 transcripts along with the Amphi-MLP/CRP3 transcripts implies the participation of Amphi-MyoD2 in the myogenic program in the notochord muscle. [source]


Prognostic and predictive factors in endocrine tumours

HISTOPATHOLOGY, Issue 6 2006
T J Stephenson
This review encompasses the diagnostic features of malignancy, the routinely observable prognostic features and the prognostic and predictive features emerging from research techniques in the principal endocrine neoplasms: pancreatic and extrapancreatic endocrine cell tumours, thyroid and parathyroid neoplasia, adrenal cortical neoplasms and adrenal and extra-adrenal paragangliomas. While each endocrine tissue has its own set of diagnostic features for malignancy, and prognostic features once a diagnosis of malignancy has been established, there are a few common themes. For several endocrine neoplasms, definite recognition of malignancy can be difficult and may depend upon frank invasive or metastatic growth at presentation. Endocrine tissues are dynamic, with hyperplastic and regressive phenomena, some of which may mimic malignancy. Even when unequivocal features of malignancy are available for observation, their distribution in tissue may be very focal, necessitating thorough sampling. The accurate documentation of routinely observable histological features interpreted in the light of current literature has not been superseded by special techniques in the statement of diagnosis or prognosis in the vast majority of endocrine neoplasms. [source]


Nonmutilating palmoplantar and periorificial kertoderma: a variant of Olmsted syndrome or a distinct entity?

INTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 6 2010
Ahmad Nofal MD
Background, Olmsted syndrome is a rare keratinization disorder characterized by mutilating palmoplantar and periorificial keratoderma as the two major diagnostic features. Some authors believe that atypical cases without this standard combination may not really belong to Olmsted syndrome. Herein, we describe two familial cases with congenital nonmutilating palmoplantar and periorificial keratoderma, and discuss their similarities and differences with Olmsted syndrome. Patients, The study included two sisters who presented with focal and punctate nonmutilating palmoplantar keratoderma (PPK), periorificial hyperkeratotic plaques, and widely distributed keratotic lesions. Fragile denuded areas of the skin were found in sites exposed to trauma. Fingernails showed a characteristic form of leukonychia. Results, Histopathology of plantar keratoderma showed psoriasiform hyperplasia with marked compact hyperkeratosis, while vicinity of denuded skin revealed thin parakeratotic zone and dissolution of the granular cell layer. Immunohistochemistry demonstrated suprabasal staining pattern for acidic keratin (AE1) and uniform positivity, starting four to six layers above the basal layer, for cytokeratin 10. Electron microscopy showed defective keratinization. Cytogenetic studies revealed normal karyotype and no chromosomal breakage. Conclusion, Our cases share Olmsted syndrome in the early onset, and the presence of symmetrical PPK, periorificial keratoderma and keratotic lesions. However, the striking nonmutilating nature of PPK and the presence of unique features in our patients suggest a newly described keratinization disorder. [source]


Cuterebra cutaneous myiasis: case report and world literature review

INTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 4 2008
Elizabeth Delshad MD
Background, Most cases of myiasis in North America are caused by fly larvae from South America or Africa, as these cases represent travelers returning from endemic regions. The etiology of creeping eruptions and furuncular lesions in North American patients who have no history of recent travel can therefore be a diagnostic problem. Among cases acquired in North America, Cuterebra species are the usual cause. Dermatologists and dermatopathologists should be aware that this unusual infestation may occur without a travel history. Method, Here we report a case of Cuterebra cutaneous myiasis acquired in New Jersey. A world literature review of articles on Cuterebra myiasis in humans, without age or year restriction, was performed. The pertinent references of those articles were also searched. Results, Most cases occur in the skin, as a furuncle. Sometimes a cutaneous creeping eruption is present. Children account for at least half of the reported cases. The infestations tend to occur in the late summer, and most frequently in the north-eastern and southern states of the United States. An overview of the clinical and histopathologic diagnostic features are presented. Conclusions, Though rare, myiasis can occur in North America without a travel history. Awareness of this entity, its epidemiologic patterns and diagnostic characteristics, can prevent lengthy delays in diagnosis and unnecessary treatments. [source]


Scarring alopecia and the dermatopathologist

JOURNAL OF CUTANEOUS PATHOLOGY, Issue 7 2001
Leonard C. Sperling
Background: The evaluation of patients with cicatricial alopecia is particularly challenging, and dermatopathologists receive little training in the interpretation of scalp biopsy specimens. Accurate interpretation of specimens from patients with hair disease requires both qualitative (morphology of follicles, inflammation, fibrosis, etc.) and quantitative (size, number, follicular phase) information. Much of this data can only be obtained from transverse sections. In most cases, good clinical/pathologic correlation is required, and so clinicians should be expected to provide demographic information as well as a brief description of the pattern of hair loss and a clinical differential diagnosis. Results: The criteria used to classify the various forms of cicatricial alopecia are relatively imprecise, and so classification is controversial and in a state of evolution. There are five fairly distinctive forms of cicatricial alopecia: 1) chronic, cutaneous lupus erythematosus (discoid LE); 2) lichen planopilaris; 3) dissecting cellulitis (perifolliculitis abscedens et suffodiens); 4) acne keloidalis; and 5) central, centrifugal scarring alopecia (follicular degeneration syndrome, folliculitis decalvans, pseudopelade). Not all patients with cicatricial alopecia can be confidently assigned to one of these five entities, and "cicatricial alopecia, unclassified" would be an appropriate label for such cases. Conclusion: The histologic features of five forms of cicatricial alopecia are reviewed. Dermatopathologists can utilize a "checklist" to catalog the diagnostic features of scalp biopsy specimens. In many, but not all, cases the information thus acquired will "match" the clinical and histologic characteristics of a form of cicatricial alopecia. However, because of histologic and clinical overlap between the forms of cicatricial alopecia, a definitive diagnosis cannot always be rendered. [source]


Role of radiology in the treatment of malignant hilar biliary strictures 1: Review of the literature

JOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY, Issue 1 2004
Michael WJ Hii
SUMMARY Malignant strictures of the biliary tree are an uncommon cause of obstructive jaundice. There are a number of pathological subtypes, but tumours in this region tend to have similar clinical and diagnostic features and therapeutic and prognostic implications. We review the published literature on this topic discussing diagnostic modalities and treatment options with a focus on radiological intervention. Diagnosis currently is best achieved using a range of procedures. Direct cholangiography remains the gold standard in delineating anatomy, but the invasiveness of this procedure limits its use as a purely diagnostic tool. Magnetic resonance technology, in particular magnetic resonance cholangiopancreatography, has an increasing role as accessibility is improved. Treatment of these tumours is difficult. Surgical resection and palliative biliary enteric bypass are the most common methods used with endoscopic and percutaneous therapies reserved for palliating patients not fit for surgery. There is little firm evidence to suggest that any one palliative modality is superior. Interventional radiology is particularly suitable for palliative management of difficult and expansive lesions as the anatomy can preclude easy access by surgical or endoscopic techniques. Good palliative results with minimal mortality and morbidity can be achieved with percutaneous stenting . [source]


Synthesis and study of a gramicidin B mutant possessing a ditryptophan crosslink

JOURNAL OF PEPTIDE SCIENCE, Issue 9 2002
Alice L. Presley Bodnar
Abstract Recent studies of peptide dimers linked by Trp-Trp (ditryptophan) crosslinks suggest that the crosslinks can reinforce antiparallel ,-structure. Depending on environment, gramicidins A, B and C form either helical ion channels with parallel ,-structure or non-functional pores with antiparallel ,-structure. In the channel conformation of the gramicidins Trp9 and Trp15 are close in space, but in the pore conformation Trp9 and Trp15 are far apart. We hypothesized that a ditryptophan crosslink between Trp9 and Trp15 could pre-organize gramicidin in an active conformation. To test the potential for pre-organization, an intramolecular ditryptophan crosslink was formed between Trp9 and Trp15 in a W13F mutant of gramicidin B. Photooxidative conditions were shown to generate ditryptophan crosslinks in low yields. While not preparatively useful, photooxidative tryptophan crosslinking may have implications for protein aging processes like cataract formation. The ditryptophan crosslink in the gramicidin B mutant substantially lowered the antibiotic activity of the gramicidin B mutant, unlike the ditryptophan crosslink in the antibiotic X-indolicidin. The biaryl chromophore generated diagnostic Cotton effects in the CD spectrum that revealed the absolute stereochemistry of the biaryl chromophore, but the biaryl chromophore obscured diagnostic features below 220 nm. However, changes in peptide conformation were reflected in changes in the biaryl region of the CD spectrum above 240 nm. Copyright © 2002 European Peptide Society and John Wiley & Sons, Ltd. [source]


Morphological and molecular examination of relationships and epitype establishment of Phacus pleuronectes, Phacus orbicularis, and Phacus hamelii,

JOURNAL OF PHYCOLOGY, Issue 5 2007
Sylwia Kosmala
Verification of morphological diagnostic features and the establishment of three epitypes for three species of Phacus Dujardin,Phacus pleuronectes (O. F. Müll.) Dujardin, Phacus orbicularis Hübner, and Phacus hamelii Allorge et Lefèvre,was performed based on literature studies and analysis of morphological (cell shape, cell size, and periplast ornamentation) as well as molecular (18S rDNA) characters. Periplast ornamentation was recognized as a main diagnostic character, distinguishing P. orbicularis from P. pleuronectes and P. hamelii. Phacus orbicularis has struts running perpendicular to the longitudinal axis of the strips, while P. pleuronectes and P. hamelii do not. On the SSU rDNA tree, obtained by the Bayesian method, P. orbicularis, P. pleuronectes, and P. hamelii belong to three distinct clades. Some of the phylogenetic relationships are not resolved, but there are at least three Phacus species (P. hamatus, P. platyaulax, P. longicauda; for taxonomic authors, see Introduction) that are more closely related to P. orbicularis than is P. pleuronectes. Phacus hamelii is more closely related to P. ranula and the assemblage of several species of Phacus, which have small cells, than to P. orbicularis or P. pleuronectes. [source]


Cutaneous T-cell lymphoma

JOURNAL OF THE EUROPEAN ACADEMY OF DERMATOLOGY & VENEREOLOGY, Issue 2 2003
EA Kotz
ABSTRACT Cutaneous T-cell lymphoma (CTCL) is a neoplasm of helper T cells whose first manifestations usually appear in the skin. The various forms of CTCL are distinguished by both clinical features and histopathology. Early on, the diagnosis may be difficult to establish because of its numerous, and often non-specific, clinical presentations. Further, the pathological findings of early lesions may lack the diagnostic features observed in well-developed or advanced disease. The diagnosis of CTCL must be considered in any patient with a chronic, therapy-resistant condition of the skin. In patients with non-specific histological findings, a high index of suspicion and multiple biopsies may eventually lead to a diagnosis of CTCL. Once the diagnosis of CTCL is established, accurate staging is essential both for its effect on treatment decisions and for its prognostic value. In general, CTCL is a chronic, slowly progressive disease with a long evolution. The development of tumours is a poor prognostic sign, as is erythroderma. The Sezary syndrome is a distinct form of erythrodermic CTCL that is characterized by exfoliative erythroderma, lymphadenopathy, lymphocytosis, intense pruritus, and circulating large, abnormal lymphocytes (Sezary cells). When death does occur, it is most often due to septicemia. Treatment of CTCL must be tailored to the individual patient. The most commonly employed treatment options are photochemotherapy and topical chemotherapy. [source]


Diagnosis of breast cancer using diffuse reflectance spectroscopy: Comparison of a Monte Carlo versus partial least squares analysis based feature extraction technique

LASERS IN SURGERY AND MEDICINE, Issue 7 2006
Changfang Zhu MS
Abstract Background and Objective We explored the use of diffuse reflectance spectroscopy in the ultraviolet-visible (UV-VIS) spectrum for the diagnosis of breast cancer. A physical model (Monte Carlo inverse model) and an empirical model (partial least squares analysis) based approach, were compared for extracting diagnostic features from the diffuse reflectance spectra. Study Design/Methods The physical model and the empirical model were employed to extract features from diffuse reflectance spectra measured from freshly excised breast tissues. A subset of extracted features obtained using each method showed statistically significant differences between malignant and non-malignant breast tissues. These features were separately input to a support vector machine (SVM) algorithm to classify each tissue sample as malignant or non-malignant. Results and Conclusions The features extracted from the Monte Carlo based analysis were hemoglobin saturation, total hemoglobin concentration, beta-carotene concentration and the mean (wavelength averaged) reduced scattering coefficient. Beta-carotene concentration was positively correlated and the mean reduced scattering coefficient was negatively correlated with percent adipose tissue content in normal breast tissues. In addition, there was a statistically significant decrease in the beta-carotene concentration and hemoglobin saturation, and a statistically significant increase in the mean reduced scattering coefficient in malignant tissues compared to non-malignant tissues. The features extracted from the partial least squares analysis were a set of principal components. A subset of principal components showed that the diffuse reflectance spectra of malignant breast tissues displayed an increased intensity over wavelength range of 440,510 nm and a decreased intensity over wavelength range of 510,600 nm, relative to that of non-malignant breast tissues. The diagnostic performance of the classification algorithms based on both feature extraction techniques yielded similar sensitivities and specificities of approximately 80% for discriminating between malignant and non-malignant breast tissues. While both methods yielded similar classification accuracies, the model based approach provided insight into the physiological and structural features that discriminate between malignant and non-malignant breast tissues. Lasers Surg. Med. © 2006 Wiley-Liss, Inc. [source]


Morphology of the first instar of Calliphora vicina, Phormia regina and Lucilia illustris (Diptera, Calliphoridae)

MEDICAL AND VETERINARY ENTOMOLOGY, Issue 1 2008
K. SZPILA
Abstract Scanning electron microscopy documentation of first instar Calliphora vicina Robineau-Desvoidy, Phormia regina (Meigen) and Lucilia illustris (Meigen) (Diptera: Calliphoridae) is presented for the first time, and the following morphological structures are documented: pseudocephalon; antenna; maxillary palpus; facial mask; labial lobe; thoracic and abdominal spinulation; spiracular field; posterior spiracles, and anal pad. Light microscopy documentation and illustrations are provided for the cephaloskeleton in lateral and ventral views. New diagnostic features are revealed in the configuration of the facial mask, cephaloskeleton and posterior spiracles. The first instar morphology of C. vicina, Ph. regina and L. illustris is discussed in the light of existing knowledge about early instars of blowflies. [source]


Prospective study of presynaptic dopaminergic imaging in patients with mild parkinsonism and tremor disorders: Part 1.

MOVEMENT DISORDERS, Issue 9 2003
3-month observations, Baseline
Abstract To record prospectively, from early presentation, the clinical features of parkinsonism and tremor disorders, in relation to evidence of dopaminergic deficit shown with [123I]-FP-CIT (DaTSCAN, Amersham Health) single photon emission computerised tomography (SPECT). Clinical signs were recorded in 62 patients, of whom 24 failed standard Parkinson's disease (PD) and essential tremor criteria, and 38 fulfilled UK Brain Bank step 1 PD criteria. Striatal radioligand uptake was graded visually as normal or abnormal, and specific:nonspecific ratios were calculated. Bradykinesia and rigidity showed significant overall association with abnormal scans (P , 0.003), but rest tremor did not (P = NS). In the 24 patients not fulfilling specific criteria (mean age 63 [SD 9] years, disease duration 3 [SD 4] years), 10 (42%) had abnormal visual SPECT assessment and 14 (58%) had normal scans. Of 38 patients with early PD by clinical criteria (mean age 60 [SD 9] years, disease duration 3 [SD 1.7] years), 33 (87%) were visually abnormal. Baseline clinical diagnosis corresponded with SPECT imaging results in 51 of 62 cases (82%), which increased to 56 of 62 cases (90%) with amendment of seven clinical diagnoses at 3 months (blind to SPECT results). Akinetic,rigid cardinal diagnostic features of parkinsonism associate well with dopaminergic deficit in patients with early and mild clinical features. When these clinical features are uncertain, or the patient fails clinical diagnostic criteria, testing for dopaminergic deficit with [123I]-FP-CIT SPECT may assist the diagnostic process. © 2003 Movement Disorder Society [source]


Potential role of the cellular allergen stimulation test (CAST) in diagnosis of allergic bronchopulmonary aspergillosis (ABPA) in cystic fibrosis

PEDIATRIC PULMONOLOGY, Issue 4 2007
Stephanie Ringer MD
Abstract Allergic bronchopulmonary aspergillosis (ABPA) is a severe complication in cystic fibrosis (CF), which is difficult to identify because of overlapping unspecific diagnostic features with common CF-manifestations. The cellular allergen stimulation test (CAST) is used in diagnosis of allergic and pseudoallergic reactions. This assay is based on the determination of sulfidoleukotrienes, which are produced by allergen-stimulated basophils in vitro. The potential role of CAST in diagnosis of ABPA was evaluated in this study. The CAST assay was applied in 27 CF-patients including eight subjects with positive clinical and serological signs of ABPA. Additional to the Nelson-criteria for diagnosis of ABPA specific IgE against recombinant Aspergillus antigens (rAsp f 1, 2, 3, 4, and 6) were assessed. The CAST results were positive in all ABPA-patients and in five controls without any sign of ABPA except positive specific IgE against Aspergillus fumigatus (sensitivity of 100%, specificity of 74%). Specific IgE against rAsp f 4 and/or f 6 were positive in six of the eight ABPA-patients, but not in the controls. Positive CAST results, total serum IgE,>,500 U/ml and positive IgE antibodies against rAsp f 4 and/or f 6 were only found in ABPA-patients (specificity of 100%). The CAST assay on its own includes high sensitivity with lower specificity. For the discrimination of ABPA from sensitization to Aspergillus, the CAST, the highly elevated total serum IgE and rAsp in combination are potential auxiliary diagnostic parameters. Pediatr Pulmonol. 2007; 42:314,318. © 2007 Wiley-Liss, Inc. [source]


Fetal enterolithiasis: prenatal sonographic and MRI diagnosis in two cases of urorectal septum malformation (URSM) sequence

PRENATAL DIAGNOSIS, Issue 4 2006
Marek Lubusky
Abstract Objectives Enterolithiasis (multiple calcifications of intraluminal meconium) is a rare, prenatal ultrasonographic finding. In this study, our aim was to evaluate the prenatal diagnostic features and discuss the management of the patients. Methods The data of two cases of prenatally diagnosed fetal enterolithiasis were collected from ultrasound scan, magnetic resonance imaging (MRI) and neonatal or postnatal autopsy records. The findings were evaluated in both prenatal and postnatal periods. Chromosomal analysis was performed in one case. An evaluation of primary and secondary malformations was done. Coexisting anomalies were searched for via radiology, neonatal surgery and histopathology. Results Malformations in two cases (both males) with partial and complete urorectal septum malformation (URSM) sequence were described. The absence of an anal opening and presence of a fistula between the urinary and gastrointestinal tract were common findings. These features were considered as primary malformations contributing to the formation of enterolithiasis. Secondary anomalies (urinary and gastrointestinal system malformations, pulmonary hypoplasia, genital and other coexisting anomalies) were evaluated. Conclusions The prenatal detection of enterolithiasis carries a poor prognosis. Most of the previously reported cases were invariably associated with major fetal malformations of the urinary and gastrointestinal tract. It is a warning sign for large bowel obstruction with or without enterourinary fistula. Therefore, adequate gastrointestinal and urologic studies must be undertaken after birth for the final diagnosis. There is a high mortality rate in the reported cases, mostly attributed to associated anomalies, and all survivors required neonatal surgery. It is important to differentiate the partial from the full URSM sequence because the prognosis in the partial URSM sequence is generally good, with long-term survival being common. Copyright © 2006 John Wiley & Sons, Ltd. [source]


,Fungal soup': Report of two cases of tumour-like blocked pulmonary cavities with liquid content infected with aspergilli, a rare form of pulmonary aspergillosis

RESPIROLOGY, Issue 2 2008
Chi Fong WONG
Abstract: Two cases of a rare and uncommonly described form of Aspergillus lung disease were diagnosed from incidental CXR abnormalities. This strange presentation has been described in the literature as ,tumour-like blocked pulmonary cavities with liquid content infected by aspergilli'. The details of these two cases are reported together with a discussion of the diagnostic features of the disease and its position in the spectrum of pulmonary diseases caused by Aspergillus. [source]


Pleural complications of pulmonary hydatid disease

RESPIROLOGY, Issue 1 2004
Mustafa Kursat Ozvaran
Objective: The aim of this study was to determine the incidence and diagnostic features of pleural manifestations of pulmonary hydatid disease. Methodology: Patients with pleural pathology in association with surgery for pulmonary hydatid disease over an 8-year period were evaluated. Results: Twenty-nine (6%) of 474 patients with histologically confirmed pulmonary hydatid disease had pleural abnormalities. The diagnosis was determined preoperatively in 22 patients and was based on radiographic, clinical, and/or serology findings. Bronchoscopic specimens were diagnostic in two of seven patients who had bronchoscopy. Five patients were not diagnosed until surgery. Radiographic abnormalities consisted of pleural thickening and/or free fluid without intrapleural rupture of the cysts in 21 patients. Eight patients had a hydropneumothorax. Sixteen patients had an exudative, uncomplicated effusion. The remaining patients had empyemas. All patients had resection of the pulmonary cysts, and 20 also underwent a pleurectomy. The mean length of hospital stay was 23 ± 14 days. There was no hospital mortality. Conclusion: Pleural lesions associated with pulmonary hydatid disease are rare and have a variable radiographic appearance. In regions in which echinococcal disease is endemic, a high level of clinical suspicion is necessary for diagnosis and appropriate management of this condition. [source]


Multiple organ failure and severe bone marrow dysfunction in two 18 year-old Caucasian patients: Epstein,Barr virus and the haemophagocytic syndrome

ANAESTHESIA, Issue 11 2008
P. A. Berry
Summary Haemophagocytic lymphohistiocytosis secondary to viral infection is an unusual but well recognised cause of bone marrow dysfunction and multiple organ failure in young patients. Two 18 year-old patients were admitted to a tertiary liver unit with features of acute liver failure, cardio-respiratory collapse and pancytopenia. Serological tests and bone marrow examination with in-situ hybridisation revealed severe acquired haemophagocytic lymphohistiocytosis secondary to acute Epstein,Barr virus infection. Both patients died despite full supportive therapy; the first due to pulmonary haemorrhage, the second due to acute respiratory distress syndrome refractory to high frequency oscillatory ventilation. The clinical spectrum, diagnostic features and current evidence based recommendations for treatment of this condition are explored. The diagnosis of haemophagocytic lymphohistiocytosis should be considered in young patients with marked bone marrow dysfunction and multiple organ failure. Further research into appropriate therapy for patients with acute severe forms of the disease who require intensive organ support is required. [source]


West Nile virus neuroinvasive disease

ANNALS OF NEUROLOGY, Issue 3 2006
Larry E. Davis MD
Since 1999, there have been nearly 20,000 cases of confirmed symptomatic West Nile virus (WNV) infection in the United States, and it is likely that more than 1 million people have been infected by the virus. WNV is now the most common cause of epidemic viral encephalitis in the United States, and it will likely remain an important cause of neurological disease for the foreseeable future. Clinical syndromes produced by WNV infection include asymptomatic infection, West Nile Fever, and West Nile neuroinvasive disease (WNND). WNND includes syndromes of meningitis, encephalitis, and acute flaccid paralysis/poliomyelitis. The clinical, laboratory, and diagnostic features of these syndromes are reviewed here. Many patients with WNND have normal neuroimaging studies, but abnormalities may be present in areas including the basal ganglia, thalamus, cerebellum, and brainstem. Cerebrospinal fluid invariably shows a pleocytosis, with a predominance of neutrophils in up to half the patients. Diagnosis of WNND depends predominantly on demonstration of WNV-specific IgM antibodies in cerebrospinal fluid. Recent studies suggest that some WNV-infected patients have persistent WNV IgM serum and/or cerebrospinal fluid antibody responses, and this may require revision of current serodiagnostic criteria. Although there is no proven therapy for WNND, several vaccines and antiviral therapy with antibodies, antisense oligonucleotides, and interferon preparations are currently undergoing human clinical trials. Recovery from neurological sequelae of WNV infection including cognitive deficits and weakness may be prolonged and incomplete. Ann Neurol 2006;60:286,300 [source]


IS THE MACROSCOPIC CLASSIFICATION OF FLINT USEFUL?

ARCHAEOMETRY, Issue 2 2009
A PETROARCHAEOLOGICAL ANALYSIS AND CHARACTERIZATION OF FLINT RAW MATERIALS FROM THE IBERIAN NEOLITHIC MINE OF CASA MONTERO
Casa Montero is a mining complex located outside Madrid (Spain), dated from the Early Neolithic (c. 5400,5000 cal bc). An area of some 4 ha has been investigated and some 4000 shafts recorded, of which 324 have been excavated. The characterization of its raw flint materials and the establishment of its diagnostic features are indispensable in the reconstruction of the distribution of the mine's products beyond the immediate site. This work reports the geological study of the mine's Miocene flint layers and their petrological characterization. Archaeological samples from the mine's shafts were classified according to macroscopic features and petrological characteristics. [source]


A New Species Group in the Genus Tanytarsus van der Wulp (Diptera: Chironomidae) Based on a Fossil Record from Baltic Amber

ACTA GEOLOGICA SINICA (ENGLISH EDITION), Issue 4 2010
Wojciech GI
Abstract: A new fossil chlronomid, Tanytarsus serafini, found in Baltic amber is described and illustrated based on adult males. The new species and similar extant species of the genus Tanytarsus van der Wulp are compared. Due to several distinct characters of wing, legs and hypopygium, a new species group for Tanytarsus serafini is proposed, and its diagnostic features are evaluated. [source]