Mammary Type Tubulolobular Carcinoma of the Anogenital Area: Report of a Case of a Unique Tumor Presumably Originating in Anogenital Mammarylike Glands

Sikl's Department of Pathology, Charles University Medical Faculty Hospital, Pilsen, Czech Republic.
American Journal of Surgical Pathology (Impact Factor: 5.15). 10/2006; 30(9):1193-6. DOI: 10.1097/01.pas.0000213255.67693.e1
Source: PubMed


We present a case of an unusual tumor that occurred in the perianal area of a 64-year-old woman. Clinical investigation revealed no tumor elsewhere. The lesion was removed and the patient is alive without signs of metastasis or recurrence 5.5 years after surgery. Histopathologically, the neoplasm was composed of single-cell cords of uniform round to ovoid cells intermixed with round to elongated tubules showing decapitation secretion at the luminal border. The tubules were mainly composed of a single cell layer, but focally multilayered epithelium (without evidence of myoepithelial cell differentiation) was seen as well as discrete cribriform structures and intraluminal bridges. Overall, the cell cord component slightly dominated over the tubular component, and the two were intermixed. A vague targetoid arrangement of the cell cords was seen focally. Immunohistochemically, the tumor cells in both components reacted positively for E-cadherin, 34betaE12, estrogen receptors and progesterone receptor and were negative for HER2/neu (c-erbB-2). There was no evidence of myoepithelial cell differentiation with calponin. We believe that the present case is best classified as mammary type tubulolobular carcinoma and, given the location, the origin in anogenital mammary-like glands most likely.

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