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Congenital Melanocytic Nevi (congenital + melanocytic_nevi)

Distribution by Scientific Domains

Medical Sciences	100%

Selected Abstracts

MEASURING CONGENITAL MELANOCYTIC NEVI

PEDIATRIC DERMATOLOGY, Issue 2 2004
Ramón Ruiz-Maldonado M.D.
No abstract is available for this article. [source]

Congenital melanocytic nevi and nevus spilus have a tendency to follow the lines of Blaschko: An examination of 200 cases

THE JOURNAL OF DERMATOLOGY, Issue 3 2007
Hiromi HANAYAMA
ABSTRACT There have been few reports about the characteristics of the pigmentary arrangement of congenital melanocytic nevi (CMN) and nevus spilus (NS). Though the lines of Blaschko, which don't correspond to other lines such as Langer's lines and skin dermatomes, are well known to be followed by some rare pigmentary disorders, the relationship between these two disorders and the lines of Blaschko has not been discussed. Therefore, through an examination of 200 cases, we investigated whether or not the arrangement of CMN and NS follow the lines of Blaschko. Thirty-nine out of 92 cases (42.4%) of CMN and 67 out of 108 cases (62.0%) of NS were considered to follow the lines of Blaschko. Today, the idea is widely accepted that two functionally different cells proliferate during early embryogenesis of the skin which is caused from mosaicism and, as a result, the lines of Blaschko appear visually. In our results, we found that there were some cases of CMN and NS which showed a relationship with the lines of Blaschko, which is meaningful considering that the lesions and the lines are both related to pigmentary gene anomalies. The result was compared with CMN and NS by the ,2 test. NS showed a predominant tendency to follow the lines with a significant difference (P = 0.0055). This may indicate that the lines of Blaschko reflect more clearly the proliferation of the epidermal cells than other cells in growth of the skin of the embryo. Further studies are required to elucidate the reason why some cases follow these lines and others do not. [source]

Small and Medium-Sized Congenital Nevi in Children: A Comparison of the Costs of Excision and Long-Term Follow-Up

DERMATOLOGIC SURGERY, Issue 12 2009
FERNANDO ALFAGEME ROLDÁN MD
BACKGROUND Clinical decisions on whether to follow up or remove small and medium congenital melanocytic nevi (SMCMN) in children have cost implications that have not been studied. OBJECTIVES To compare the costs of excision of SMCMN in children with lifelong follow-up in a tertiary center. METHODS AND MATERIALS We elaborated models for the evaluation of the costs of excision and long-term follow-up. We retrospectively collected data on 113 consecutive excised SMCMN (105 single-step interventions and 8 multiple-step interventions) from the medical records of our pediatric dermatology unit from 2001 to 2007 and calculated and compared the costs (direct and indirect) of surgery and follow-up. RESULTS The mean ± standard deviation and total cohort costs for single-step interventions were ,1,504.73 ± 198.33 and 157,996.20, respectively. Median and cohort lifelong follow-up costs were similar if performed every 4 years (1,482.66 ± 34.98 and 156,679.63). For multiple-step interventions (3 or 4 steps), surgery costs were similar to those of annual lifelong follow-up. In the case of two-step surgery, costs were similar to lifelong follow-up every 2 years. CONCLUSIONS An analysis of the costs of surgery and long-term follow-up in children with SMCMN is possible. Although the clinical judgment of the dermatologist and parental opinion are the main determinants in the management of SMCMN, costs should also be taken into account. [source]

G1 cell cycle regulators in congenital melanocytic nevi.

JOURNAL OF CUTANEOUS PATHOLOGY, Issue 9 2008
Comparison with acquired nevi, melanomas
Background:, Congenital nevi are one of the known risk factors for the development of melanoma. However, the magnitude of the risk for both large and small congenital nevi is controversial. Methods:, In order to elucidate the behavior of congenital nevocytes and to define any possible similarities or differences with common nevi and melanomas, we investigated the expression of Ki-67, Rb, p16, cyclin D1, p53 and p21/Waf-1 in 41 congenital nevi, 16 melanomas and 20 acquired common nevi by immunohistochemistry. Results:, Congenital nevi highly expressed p16 (81.82 ± 9.98) but showed limited, if any, reactivity for Ki-67 (1.34% ± 0.89), Rb (0.76% ± 0.94), cyclin D1 (0.21% ± 0.29), p53 (0.54% ± 0.93) and p21 (0.0609% ± 0.32). No statistically significant difference was found between giant and nongiant congenital nevi and between congenital and common nevi for any of the markers. The expression of p16 was significantly higher in congenital nevi than in melanomas (p < 0.0001). On the contrary, the expression of Ki-67, p53, p21, Rb and cyclin D1 was significantly higher in melanomas (p < 0.0001). Conclusion:, Our data regarding the immunohistochemical expression of Rb, p16, p53, cyclin D1 and Ki-67 in congenital nevi indicate that either the alteration of their expression is not an initiating event in melanoma formation or, alternatively, congenital melanocytic nevi may not be the first step in malignant transformation. [source]

Dermoscopy of an Acral Congenital Melanocytic Nevus

PEDIATRIC DERMATOLOGY, Issue 3 2005
Iris Zalaudek M.D.
Dermoscopy improves the early detection of melanoma while reducing the number of unnecessary excisions of benign pigmented skin lesions. Dermoscopically, congenital melanocytic nevi are often characterized by the presence of a cobblestone pattern, but to date, little is known about the dermoscopic features of acral congenital melanocytic nevi. We report an acral congenital melanocytic nevus typified by the presence of three different dermoscopic patterns that are commonly seen in acquired melanocytic nevi of palms and soles. [source]

Neurocutaneous Melanosis with Transposition of the Great Arteries and Renal Agenesis

PEDIATRIC DERMATOLOGY, Issue 4 2003
M.D., Nilgün Köksal
A 6-day-old infant boy was referred to our department with giant congenital melanocytic nevi and convulsions. On physical examination the patient had a giant black-brown pigmented nevus covering his face, neck, scalp, shoulders, back, chest, and abdomen. Numerous satellite lesions were noted on the face, neck, and upper extremities. In the right bulbar conjunctiva, a brown plaque was present. Magnetic resonance imaging (MRI) showed hyperintense areas in the brain on short repetition time/short echo time sequences, compatible with intraparenchymal melanin deposits. No leptomeningeal abnormality was seen. Further investigation also revealed agenesis of the right kidney and transposition of the great arteries. Transposition of the great arteries, which has never been reported in NCM, may be an incidental finding. We present a case of NCM associated with agenesis of the right kidney and transposition of the great arteries. [source]

Cerebral Mass Due to Neurocutaneous Melanosis: Eight Years Later

PEDIATRIC DERMATOLOGY, Issue 5 2001
Julie V. Schaffer M.D.
Neurocutaneous melanosis (NCM) is associated most commonly with giant congenital melanocytic nevi (CMN), in particular those on the scalp or in a posterior axial location that are accompanied by satellite congenital nevi. It also can occur in patients with multiple medium-sized CMN. In general, the prognosis of those with symptomatic NCM is poor, even in the absence of malignancy, while the prognosis of those with asymptomatic NCM detected via screening varies and is more difficult to predict. Herein we report an asymptomatic patient with a giant CMN and multiple satellite nevi who had a screening magnetic resonance imaging (MRI) study at age 5 months that showed a rounded area of increased signal in the right temporal lobe on T1-weighted images, suggestive of parenchymal melanosis. This melanotic mass was resected at age 10 months, and histologic examination of the surgical specimen showed prominent perivascular collections of benign, pigment-containing melanocytes within cerebral tissue. The patient remains healthy 8 years later. His excellent long-term outcome and other reports of NCM with localized central nervous system (CNS) involvement apparent on MRI may have implications for management, including early imaging of patients with high-risk CMN and potential surgical intervention for NCM. [source]

Giant Congenital Nevus with Progressive Sclerodermoid Reaction in a Newborn

PEDIATRIC DERMATOLOGY, Issue 4 2001
Sean F. Pattee B.S.
Giant congenital melanocytic nevi are a rare occurrence in the pediatric population. The risk of malignant transformation associated with these lesions has been well established; however, the management strategies for giant congenital nevi remain controversial. We report an unusual sclerodermoid reaction in a giant congenital nevus in a 6-week-old Caucasian girl. Given its abnormal clinical appearance, the entire lesion was excised. The histology was consistent with an atypical compound/sclerosing spindle and epithelioid cell congenital nevus. No evidence of malignant change was seen histologically. The incidence of malignant transformation in giant congenital nevi has been difficult to calculate. Review of the literature yields an incidence of between 4 and 9%, favoring surgical excision of these lesions where possible. Atypical presentations of giant congenital nevi are rare, and we have found no other reported cases with a stromal change similar to that seen in our patient. We hypothesize that this change may represent an atypical host reaction to the nevus cells. [source]