METASTATIC MENINGIOMA - HEMANGIOPERICYTOMA OR ANGIOBLASTIC MENINGIOMA

The question of whether meningeal hemangiopericytoma is a variant of m eningioma (''angioblastic meningioma'') or a nosologically distinct en tity remains controversial. We present the case histories of an intrac ranial meningioma and of a meningeal hemangiopericytoma, both of which developed extracranial metastases. The metastatic lesions in both cas es were studied by electron microscopy, which demonstrated pericytomat ous differentiation in one instance and meningothelial differentiation in the other. This report supports the opinion that meningeal hemangi opericytomas and meningiomas of the CNS are distinct pathological enti ties.