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Archives of Dermatological Research
Erschienen in: Archives of Dermatological Research 4/2018

07.02.2018 | Original Paper

Reevaluation of established and new criteria in differential diagnosis of Spitz nevus and melanoma

verfasst von: A. Ritter, M. Tronnier, B. Vaske, C. Mitteldorf

Erschienen in: Archives of Dermatological Research | Ausgabe 4/2018

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Abstract

The histopathologic differentiation between Spitz nevus and melanoma is of particular interest in routine diagnostic procedures of melanocytic tumors. Atypical Spitz nevi are sometimes difficult to distinguish from melanoma. There is still no single criterion that ensures a distinction of melanoma and atypical Spitz nevus. The aim of this study was to reevaluate established and new criteria to differentiate Spitz nevus from melanoma more reliably. We analyzed 25 melanomas with a Breslow index ≥ 1 mm and 18 classical compound Spitz nevi concerning their histopathologic, immunohistochemical and molecular genetic characteristics. Moreover, clinical follow-up data for 5 years were collected. We found statistically significant differences between Spitz nevus and melanoma for the following features: pagetoid spread, atypia, maturation, elastosis, Kamino bodies, p16 expression, and the staining pattern of HMB45. BRAF was positive in 7/21 melanomas and in 1/14 Spitz nevi. Fluorescence in situ hybridization confirmed the histopathologic diagnosis in 36/37 cases. The established clinical, histopathologic, and immunohistochemical criteria to differentiate Spitz nevus and melanoma could be reproduced in our collective. Especially, the expression of p16, BRAF analysis and fluorescence in situ hybridization proved to be helpful tools to improve the differentiation of Spitz nevus and melanoma in our study. Nevertheless, there is—until now—no reliable histopathologic and immunohistochemical parameter which can discriminate Spitz nevus and melanoma with absolute certainty.
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Metadaten
Titel
Reevaluation of established and new criteria in differential diagnosis of Spitz nevus and melanoma
verfasst von
A. Ritter
M. Tronnier
B. Vaske
C. Mitteldorf
Publikationsdatum
07.02.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Archives of Dermatological Research / Ausgabe 4/2018
Print ISSN: 0340-3696
Elektronische ISSN: 1432-069X
DOI
https://doi.org/10.1007/s00403-018-1818-8

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