JOURNAL ARTICLE

Sebaceous carcinoma arising in nevus sebaceus of Jadassohn: a clinicopathological study of five cases

Dmitry V Kazakov, Eduardo Calonje, Bernhard Zelger, Bostjan Luzar, Irena E Belousova, Petr Mukensnabl, Michal Michal
American Journal of Dermatopathology 2007, 29 (3): 242-8
17519621
The authors report a small series of sebaceous carcinoma developing in nevus sebaceus of Jadassohn (also known as organoid nevus) and analyze similar cases reported in the literature. All of our patients were females (age range 57-71 years; median 60 years) who had the organoid nevus on the scalp, face, or nuchal area, the rest of which was recognized clinically and/or histologically. All sebaceous carcinomas manifested unquestionable architectural (asymmetry, invasive growth) and cytological features of a carcinoma (cellular and nuclear pleomorphism, plentiful atypical mitoses, necroses en masse), demonstrated unambiguous sebaceous differentiation in the form of mature sebocytes, and lacked other differentiations. The sebaceous carcinoma was always accompanied by other benign or malignant adnexal lesions such as sebaceoma, syringocystadenoma papilliferum, syringocystadenocarcinoma papilliferum, trichoblastoma, tricholemmoma, desmoplastic tricholemmoma, or syringoma. In three cases, prominent mucinous metaplasia of sweat ducts and glands was seen. In two of these cases, sweat ducts exhibited hyperplastic changes. The analysis of the previously published material and our cases indicates that sebaceous carcinoma arising in organoid nevus has a female predilection and tends to occur in elderly patients. It may involve any site where nevus sebaceus typically occurs. Clinically, the tumor presents as a solitary nodule, ulcerated tumor, or mass, often with a recent history of rapid growth. It may arise alone, but it occurs more frequently as part of multiple benign and malignant adnexal tumors. The lesion does not seem to be associated with Muir-Torre syndrome. The rest of organoid nevus is usually recognized both clinically and microscopically, although large tumors may overgrow and mask the nevus. The tumor seems to be a low-grade carcinoma in terms of clinical behavior.

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