title: Giant cell tumor of sphenoid bone: malignant transformation following radiotherapy.
mesh_terms: D000328:Adult; D002533:Cerebral Angiography; D005354:Fibrosarcoma / Q000209:etiology* / Q000473:pathology; D005870:Giant Cell Tumors / Q000175:diagnosis / Q000473:pathology / Q000532:radiotherapy*; D006801:Humans; D007018:Hypopituitarism / Q000209:etiology; D008297:Male; D011011:Pneumoencephalography; D012658:Sella Turcica / Q000000981:diagnostic imaging; D012888:Skull Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000532:radiotherapy*; D013100:Sphenoid Bone / Q000473:pathology / Q000528:radiation effects*