Fibrous histiocytoma: benign and malignant variants.

Twenty cases of benign and malignant fibrous histiocytoma are presented. Six were benign, 11 malignant fibrous, and 3 pure malignant histiocytomas. These tumours arise from tissue histiocytes and have a wide range of histological appearances. The characteristic histological features are described and the variable clinical picture and different lines of treatment and management are discussed.