title: Hemangiopericytoma: ultrastructural study of five cases.
mesh_terms: D000328:Adult; D001485:Basement Membrane; D002196:Capillaries / Q000473:pathology*; D002467:Cell Nucleus; D003239:Connective Tissue Cells; D004727:Endothelium / Q000166:cytology; D005260:Female; D006393:Hemangiopericytoma / Q000473:pathology*; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged