[Two cases of haemangiopericytoma (author's transl)].

The authors report 2 cases of haemangiopericytoma, one cervical and the other endolaryngeal. They emphasise the value of precise histological study which is alone capable of confirming the diagnosis. But in fact the existence of transitory forms leaves many incertainties with regard to the prognosis of these tumours and it is difficult to adopt a coherent therapeutic attitude.