Seventeen chronic hemodialyzed patients underwent a baryum meal, a fibroscopy with biopsic studies and an evaluation of gastric acid secretion. No duodenal ulcer was found. The gastric and duodenal folds are the most common anomaly. It has been not possible to correlate these folds to a precise histological entity. None of these patients exhibited an hypersecretory state, on the other hand 3 of them were hyposecreting. A statistical relationship between BAO on the one hand and PTH, CT and Ca on the other hand was found.