title: The oral hemangiopericytoma--a rare tumor.
mesh_terms: D005887:Gingival Neoplasms / Q000473:pathology*; D006393:Hemangiopericytoma / Q000473:pathology*; D006801:Humans; D008297:Male; D008441:Maxillary Neoplasms / Q000473:pathology; D008875:Middle Aged; D009361:Neoplasm Invasiveness