Abstract
Duodenoscopy and endoscopic retrograde Choledochopancreatography represent a major advance in the diagnosis of periampullary and pancreatic lesions. Instruments, techniques and complications are reviewed. A combination of endoscopy and ERCP will yield diagnosis in a high proportion of patients suspected of pancreatic or ampullary carcinomata. Information is obtained which is not only of diagnostic value but is important in the surgical treatment of such patients.