Abstract
The commonest cause of obstruction to the gastric outlet in the adult is peptic ulceration, usually duodenal but occasionally pyloric, prepyloric or even in the body ofthe stomach. Second to this comes carcinoma of the distal portion of the stomach. Other causes are numerous but unusual; they include adult hypertrophy of the pylorus, benign tumours, infiltration by one of the reticuloses, heterotopic pancreatic tissue at the pylorus, a prepyloric mucosal diaphragm or fibrous adhesions between the duodenum and an inflamed gall-bladder or to the liver bed following cholecystectomy. The causes of pyloric stenosis in a consecutive series of 130 patients at Westminster Hospital are shown in Table 1.
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