Epithelioid angiomyolipoma: appearance on fine-needle aspiration report of a case.

Epithelioid angiomyolipoma is a recently recognized clinicopathologic entity first described by Martignoni et al. in 1995. Since then, several articles have further clarified its histogenesis and histologic features. Due to the presence of polygonal cells with voluminous cytoplasms, this neoplasm is often mistaken for renal-cell carcinoma. In this case presentation, we describe the cytologic features of an epithelioid angiomyolipoma obtained by fine-needle aspiration. The histogenesis and how it relates to diagnosis is briefly discussed. The importance of ancillary techniques in the differential diagnosis of epithelioid cells obtained in a renal aspirate is reviewed. Copyright 2000 Wiley-Liss, Inc.