Analysis of alterations adjacent to invasive squamous cell carcinoma of the penis and their relationship with associated carcinoma

Journal of the American Academy of Dermatology
Catherine Renaud-VilmerLouis Dubertret

Abstract

In contrast to vulvar squamous cell carcinoma (SCC), the etiologic factors and precancerous lesions associated with penile carcinoma remain uncertain. To describe the morphologic features of lesions adjacent to invasive penile SCC and their relationship with the associated carcinoma and to compare these associations with vulvar carcinoma. This was a retrospective histologic analysis of 68 cases of penile SCC. Adjacent lesions were considered to be premalignant lesions. They were classified as penile intraepithelial neoplasia (PIN), squamous hyperplasia (SH), and lichen sclerosus (LS). PIN cases were divided into two subtypes depending on the extension of atypia throughout the epithelium and, by analogy, with the classification of the vulvar intraepithelial neoplasia (VIN). Thus they were designated as undifferentiated (or bowenoid) PIN, defined by full-thickness atypia throughout the epithelium, and differentiated PIN, characterized by atypia confined to the lower third of the epithelium. SCC subtypes were classified as usual, verrucous, warty (condylomatous), basaloid, and mixed. Undifferentiated PIN was observed in 22 cases; LS was observed in 26 cases. Differentiated PIN and SH (except for two cases) were associated with und...Continue Reading

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