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. Grainger & Allison's Diagnostic Radiology. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008: chap 32.
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