HEMANGIOPERICYTOMA - A CLINICAL AND RADIOLOGICAL COMPARISON WITH ATYPICAL MENINGIOMAS

A small number of haemangiopericytomas (HPCs) are compared with a grou p of cases labelled as atypical meningiomas (AMs) extracted from our r ecords over a 10-year period. There was close convergence between the two groups in terms of clinical presentation. Radiologically, they wer e quite different. HPCs subjected to angiography demonstrated a major vascular supply from branches of the internal carotid or vertebral art eries, whereas this was not a feature of the meningioma group. Half th e HPCs arose from the lateral petrosal attachment of the tentorium; al l the meningiomas were parasagittal. The HPCs did not prove to be more formidable technical challenges than the meningiomas: the operative b lood loss was much the same in both. The same number of recurrences an d deaths occurred in the two groups at approximately the same interval during the follow-up period, making both conditions equally grave in terms of prognosis.