[Selective cannulation of Vater's ampulla]

A review was done on the general aspects of Endoscopy Retrograde Cholangiopancreatography (ERCP) as a method of diagnosis. A brief description is made on the historical and technical aspects. Emphasis is made on the diverse diseases that exist on the biliary tract, pancreas and the ampulla, in which ERCP is indicated. The results are mentioned and compared with those of other diagnostic procedures. The most common complications are discussed, as well as why they occur, and how they can be avoided. Specific circumstances are mentioned in which ERCP has limitations.