title: Pre-irradiation and postirradiation nasopharyngography.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging* / Q000532:radiotherapy; D002404:Catheterization; D003287:Contrast Media; D006801:Humans; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000145:classification / Q000000981:diagnostic imaging* / Q000532:radiotherapy; D009305:Nasopharynx / Q000000981:diagnostic imaging*; D011859:Radiography; D014636:Valsalva Maneuver
chemical_list: D003287:Contrast Media