title: Shadow or substance.
mesh_terms: D001466:Barium Sulfate; D006801:Humans; D007414:Intestinal Neoplasms / Q000000981:diagnostic imaging*; D007583:Jejunum / Q000503:physiopathology*; D008875:Middle Aged; D010437:Peptic Ulcer / Q000175:diagnosis; D011859:Radiography
chemical_list: D001466:Barium Sulfate