MONDO_0000938 (gastric leiomyoma) is a rare benign smooth muscle neoplasm arising from the wall of the stomach. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. Unlike gastrointestinal stromal tumors, gastric leiomyomas are by definition negative for CD34 and CD117 (C-KIT). Also known as: leiomyoma of stomach, leiomyoma of the stomach, stomach leiomyoma.