Dermatofibrosarcoma protuberans. An ultrastructural study of five cases.

An ultrastructural study of five cases of dermatofibrosarcoma protuberans revealed that the basic cell was a spindle shaped fibroblast with a peculiar deeply lobulated nucleus. An origin from perineural and endoneural cells could not be established since basal lamina material was sparsely present in only one case and other differential features were missing. In one case histiocytic cells were found, but also in this case the basic cell was the fibroblast; so evidence of relationship with fibrous histiocytoma was not found.