94 year-old woman with a small ulcer on the posterior gastric wall, caused by the tip of an indwelling feeding gastrostomy tube. At the time of endoscopy, the internal balloon of the feeding tube had been partially deflated. Endoscopy was performed because the family reported difficulty feeding the patient via the gastrostomy tube when the patient was sitting upright, but no difficulty with the patient supine. The endoscopic findings suggested that the tip of the tube was becoming impacted against the posterior gastric wall whenever the patient was placed in the sitting position.