Pyloric stenosis is a serious complication of acid peptic disease of the stomach. The treatment with balloon dilation by endoscopy has been reported successfully and with few complications. We use a therapeutic endoscope and different diameter dilators during various sessions. We report our experience in 18 patients with high surgical risk and peptic pyloric stenosis during four years (january 1988 to december 1991). Our results were satisfactory and we believe this technique could be used as a valid alternative to surgical procedures in high risk patients.