SOFT-TISSUE ONCOCYTOMA

We describe a case of a novel soft tissue neoplasm, composed of a mono tonous population of cells. Their cytoplasm was packed with mitochondr ia, and had no immunohistochemical or ultrastructural evidence of diff erentiation. The neoplasm, located within the thigh of a 50-year-old m an, was well-circumscribed but unencapsulated. The patient was clinica lly free of neoplasm at 1 year followup, after complete local excision , We propose the term ''soft tissue oncocytoma'' for this lesion, beca use of the similarity of this neoplasm to oncocytomas of other reporte d sites. Copyright (C) 1996 by W.B. Saunders Company.