[Haemangiopericytomas of the uterus. 4 case histories (author's transl)].

The authors report four cases of uterine haemangiopericytoma. These vascular tumours develop at the expense of the pericytes of Zimmermann. They are very rare since only 64 cases have been reported. The haemangiopericytomas of the uterus are clear cut histologically and as far as their ultrastructure is concerned. They therefore can be clearly distinguished from other connective tissue tumours which develop in the uterus and especially in the stroma of the endometrium. They should be considered as slow growing sarcomata of the myometrium as a study of the embryogenesis of the genital tract shows. Their prognosis is guarded.