New experiences with Welin's double-contrast method.
D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D003287:Contrast Media; D006801:Humans; D008722:Methods; D009362:Neoplasm Metastasis; D011379:Prognosis; D011859:Radiography; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging*
D003287:Contrast Media