[Clinical, radiologic and histomorphological aspects of the hemangiopericytoma head and neck region].

Three hemangiopericytomas of the head and neck region with different clinical development are presented. In one patient the tumor was benign, in the two others malignant. In contrast to the opinion prevailing in the literature, histological criteria were found by means of which the degree of malignancy of these three tumors could be established. Irrespective of the degree of malignancy, radical surgery is recommended as therapy. Postoperative radiotherapy follows in those cases where a safety margin of clinically non-involved tissue surrounding the tumor could not be removed.