A 22-year-old woman who had abdominal pain and diarrhea from 5 days ago got a CT scan in the hospital of origin and had a tumor about 5 cm in the stomach and bleeding. Upper gastrointestinal endoscopy revealed a large gastric submucosal tumor in pylorus. We considered it a malignant gastric submucosal tumor, and performed surgery, it was diagnosed as gastric plexiform fibromyxoma. Gastric plexiform fibromyxoma is a rare gastric mesenchymal tumor first reported by Takahashi et al. in 2007. Gastric plexiform fibromyxoma usually causes nonspecific symptoms of bleeding signs and is often operated on for that reason. However, surprisingly, plexiform fibromyxoma is a benign tumor with no reports of metastasis or recurrence.
