"Apocrine" poroma: review of the literature and case report

Background: "Apocrine" poroma has recently been proposed as a new term to d esignate a distinctive benign skin neoplasm with differentiation toward the folliculosebaceous-apocrine unit. Case report: In support of alternative differentiation, a case of apocrine poroma is reported in a 73-year-old man. A nodule on the right upper abdome n, which was thought clinically to be seborrheic keratosis or basal cell ep ithelioma, was excised. Histology: Histologically, this neoplasm heterogeniously consisted of porom a-like, sebaceous and follicular epithelial components. Since these compone nts share the common embryologic origin of the folliculosebaceous-apocrine unit, this histologic pattern indicates apocrine differentiation of the tum or. Conclusion: This is an additional case to support the term "apocrine" porom a as a diagnosis.