A leiomyoma is a noncancerous (benign ) tumor made up mostly of smooth muscle cells. It is called an intestinal leiomyoma when the tumor is located in the intestinal tract.
Leiomyoma - intestine
Gourtsoviannis N, Papanikolaou N, Daskalogiannaki M. The duodenum and small intestine. In: Adam A, Dixon AK, eds. . 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008: chap 32.
Digestive system organs