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Am J Dermatopathol. 2012 Jun;34(4):438-41. doi: 10.1097/DAD.0b013e31822e6895.

Anal apocrine carcinoma: a case report and literature review.

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  • 1Department of Pathology, University of Utah Hospitals, Salt Lake City, UT 84112, USA.

Abstract

Apocrine carcinoma (AC) is an extremely rare skin appendage tumor, which is located at lower dermal and subcutaneous tissue. We report a case of an anal AC arising from an apocrine adenoma in the anal region, which is only the second case reported in this region. A 71-year-old male presented to clinic with soreness in the anal region for 6 weeks. An excisional biopsy was performed. Histologically, the lesion was poorly circumscribed, infiltrative, and was composed of small to medium sized glands extending to the surgical margins. There were centrally dilated large glands with duct-like openings into the mucosal surface. The larger central glands contain periodic acid-Schiff-positive eosinophilic acellular secretions. At the periphery, there were smaller glands with significant cytologic atypia and numerous mitoses. A diagnosis of AC was made making it the second case report of this very rare malignancy in this region. Although ACs usually do not have a fatal outcome, there have been case reports of distant metastases and even death from this disease, making histologic distinction of this malignancy from a benign apocrine adenoma important. Wide local excision is typically the treatment of choice, although Mohs micrographic surgery has also been used with similar success.

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