hemangiopericytoma hemangiopericytoma, malignant ICDO:9150/3 MESH:C562740 MONDO:0009330 An uncommon malignant neoplasm arising from pericytes. Distinction between benign and malignant hemangiopericytoma may be difficult or even impossible on morphologic grounds alone. hemangiopericytoma, malignant NCIT:C4301 malignant hemangiopericytoma UMLS:C0334542 OMIM:234820 MEDGEN:90803 GARD:0002627 solitary fibrous tumor