connective tissue cancer hemangiopericytic tumor hemangiopericytoma An antiquated term that refers to benign or malignant mesenchymal neoplasms characterized by the presence of neoplastic spindle-shaped to round cells arranged around thin-walled branching vascular spaces. DOID:264 ICDO:9150/1 MESH:D006393 MONDO:0005094 NCIT:C3087 SCTID:134335004 haemangiopericytic meningioma haemangiopericytic meningioma [obs] hemangiopericytoma hemangiopericytoma, malignant hemangiopericytoma, malignant (morphologic abnormality) malignant hemangiopericytoma