A 24-year-old man presented complaining of epigastralgia and tenderness in the epigastric region. An abdominal computed tomography revealed a low density tumor, extending between the anterior wall of the stomach and the abdominal wall. Because the tumor was found to enlarge, an operation was performed to remove the tumor. During the operation, it was revealed that the tumor was connected with the lesser omentum, which suggested that it had originated from the lesser omentum. We diagnosed an inflammatory myofibroblastic tumor based on the pathological examination, which revealed infiltration of inflammatory cells, sparse proliferation of spindle cells and limited proliferation of collagen fibers, characterized by an irregular arrangement.
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