PLEXIFORM FIBROHISTIOCYTIC TUMOR - HISTOL OGY, IMMUNOHISTOLOGY AND ULTRASTRUCTURE

An example of a plexiform fibrohistiocytic tumour (PFT) is presented f or the first time in the German-language literature. The diagnostic cr iteria for this rare soft-tissue neoplasm of childhood and young adult hood, which is mostly subcutaneous in location and has a tendency to r ecur, include the plexiform structure which gives it its name, extensi ve siderin deposits and numerous osteoclast-like giant cells. The deve lopment of the tumour described here, which occurred in the field of r adiation of a malignant haemangiopericytoma excised 7 years previously , indicates the possibility of induction of PFT by radiation.