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

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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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Authors and Affiliations

  1. Department of Dermatology, Venereology and Allergology, HELIOS-Klinikum Hildesheim, Senator-Braun-Allee 33, 31135, Hildesheim, Germany

    A. Ritter, M. Tronnier & C. Mitteldorf

  2. Institute of Biometry, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany

    B. Vaske

  3. Department of Dermatology, Venereology and Allergology, University Medical Center, Georg-August-University, Robert-Koch-Straße 40, Göttingen, Germany

    C. Mitteldorf

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  1. A. Ritter
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This manuscript is part of the doctoral thesis of Alexandra Ritter.

Parts of this work were presented as a lecture on the meeting of the North German Society of Dermatology, 2013.

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Ritter, A., Tronnier, M., Vaske, B. et al. Reevaluation of established and new criteria in differential diagnosis of Spitz nevus and melanoma. Arch Dermatol Res 310, 329–342 (2018). https://doi.org/10.1007/s00403-018-1818-8

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