title: Ultrastructure of nasopharyngeal angiofibromas.
mesh_terms: D000293:Adolescent; D005260:Female; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology*; D006801:Humans; D008297:Male; D008407:Mast Cells; D008854:Microscopy, Electron; D009303:Nasopharyngeal Neoplasms / Q000473:pathology*