The patient was a man in his 70s. During hospitalization for glycemic control for diabetes mellitus, an upper gastrointestinal endoscopy was performed. Endoscopic ultrasound revealed infiltration into the proper muscle layer, and laparoscopic pyloric gastrectomy was performed. Gastrointestinal stromal tumor was observed incidentally in the vicinity of gastric cancer in the resected specimen. Gastric cancer and GIST complications are extremely rare, and we report them with a review of the literature.
