[Ultrastructural and cytological study of atypical fibroxanthoma].

A case of atypical fibroxanthoma of the skin is related. Ulstrastructural findings include: fibroblast-like cells, histiocytic-like cells, xanthomatous cells, and multinucleated cells. Strikingly similar findings were found by Fu and cols. (1975) in four cases of malignant fibrous histiocytoma. The authors postulated that both tumours could represent different aspects of a single proliferating process.