[Hypertrophic pyloric stenosis in the adult. Presentation of 4 cases]

4 cases of hypertrophic stenosis of the pylorus, an infrequent benign disease often associated with gastro-duodenal lesions and characterized by narrowing and lengthening of the channel owing to hypertrophy-hyperplasia of the circular muscular fibres, are reported. Aetiopathogenesis, diagnosis and therapy, namely always gastric resection, are discussed.