The records of all patients who underwent pylorus-preserving pancreatic resection (29 subtotal and 4 total pancreatectomies) during a 10-year period at the Mayo Clinic were reviewed. Thirty-day operative mortality was 6%. Early postoperative morbidity occurred in 45% of patients and necessitated reoperation in four patients. One patient had a hemorrhage from a marginal ulcer in the early postoperative period. The incidence of late postoperative morbidity was 18%. Marginal ulcers developed in the late postoperative period in three additional patients, for an overall incidence of 13%. One patient underwent vagotomy and pyloroplasty because of intractable bleeding 2 years after initial operation. The 29 patients who underwent pylorus-preserving pancreatoduodenectomy (PPW) were compared (retrospectively) with 200 patients who had undergone standard pancreatoduodenectomy (Whipple operation) during the same 10-year period. The overall incidences of marginal ulcer were 10% in the PPW group and 5% in the Whipple group; the incidences of delayed gastric emptying were similar in these groups. We believe that caution is warranted in the use of PPW, as yet an unproved procedure.