抄録
Based on 4, 247 X-ray examinations of the upper gastrointestinal tract in the Department of Radiology, Niigata University, concomitant gastric and duodenal ulcers were analyzed statistically. The frequency of gastric ulcer among patients with duodenal ulcer is higher than that among patients with other than duodenal ulcer, with a statistical significant difference. This fact indicates that coexistence of gastric and duodenal ulcers is not incidental.