[Double contrast radiological exploration of the major duodenal papilla (author's transl)].

The major duodenal papilla can be outlined in 75% of cases by double contrast examination. It is composed of an oval-shaped nodule covered by a mucous cap which is prolonged into a frenum in its lower part. Its mean dimensions are 11 X 7 X 6 mm. Many variations are observed, and these are analyzed as well as the features suggesting pathological modifications. These may arise from inflammation: during the course of primary or secondary (ulcer, pancreatitis) duodenitis, or be related to a stone blocked in the region of the ampulla. Tumors in this region are rare, and are usually malignant tumors, the characteristics and extension of which can be determined from radiological images. Use of this radiological technique as a preliminary step enables a complete study of the upper digestive tract to be conducted at the same time.