title: Foramen magnum tumors--report of 21 cases.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D005539:Foramen Magnum; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012888:Skull Neoplasms / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000601:surgery; D013125:Spinal Neoplasms / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery