[Malignant fibrous histiocytoma of the larynx].

Report on two patients with (malignant) fibrous histiocytomas of the larynx. Fibrous histiocytomas of the larynx, malignant or benign are extremely rare. Because of the variety of the tissue the histiological diagnosis of these tumours--especially with regard to the tumour status--can cause great difficulties. Basing on our cases and on the few previous publications on this subject, the biological behaviour and therapy of laryngeal histiocytomas, as well as differential diagnoses of other neoplasms, are discussed. Since the (malignant) fibrous histiocytomas often recur locally, even tumours without unequivocal histological malignancy must be treated by extensive excision.