What is your diagnosis? Gastric leiomyoma.

Smooth muscle tumors are the second most common benign tumors of the stomach after adenomatous polyps. Most often they present as solitary submucosal lesion. Occassionally they may be multiple. They usually present as a smooth mass, although they may be pedunculated and rarely present as gastroduodenal intusuception, when they are located in the distal antrum and prolapse into the duodenum. Leiomyomas may be submucosal, intramural or subserosal. Because of this peculiarity they may grow predominantly intraluminal as well as extraluminally.