Abstract 1. 1. The surgical treatment of complicated duodenal ulcer is outlined. 2. 2. The dangers of radical gastroduodenal resection carried beyond an involved duodenal ulcer are emphasized. 3. 3. A plea for subtotal gastrectomy of the Finsterer type is made. 4. 4. A conservative modified subtotal prepyloric gastrectomy is briefly described. The details of handling the pyloric stump and its mucosa are given.