Barium outlining the maxillary sinus.
D001466:Barium Sulfate; D005767:Gastrointestinal Diseases / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D008875:Middle Aged; D011859:Radiography
D001466:Barium Sulfate