[Duodenal stenosis in coincidence with annular pancreas and cancer of the papilla].

We report on a case of annular pancreas complicated by the development of a carcinoma of the papilla causing secondary chronic obstructive pancreatitis. Eventually, a high-grade stenosis of the duodenum developed, leading to symptoms of gastric outlet obstruction. The stenosis was proved by endoscopic and radiologic diagnosis, but the exact anatomical condition was only revealed by an operation. Efficient diagnostic and therapeutic procedures in annular pancreas with its potential complications are discussed in detail.