It is reported on the endoscopic proof of a double pylorus in a 57-year-old patient. The anamnesis of ulcer of many years and a florid prepyloric gastric ulcer refer to the ulcerous origin of this anomaly. It is referred to the diagnostic importance of the gastroscopy of the acquired or congenital duplication of the pylorus channel which is difficult to be represented radiologically with regard to the avoidance of possible diagnostic errors (e.g. carcinoma of the antrum).