Plexiform Fibromyxoma of The Stomach: A Rare Case Report And Review of Literature

Abstract Background: Plexiform fibromyxoma (PF) is a very rare mesenchymal tumor of the stomach. Here we report one case of this unusual gastric tumor that was pathologically confirmed after endoscopic resection. Its clinical and pathologic features were observed while the relevant literature was reviewed. Case presentation: A 1.0 cm round elevated submucosal mass was discovered by gastroscopy in a 44-year-old Chinese woman due to recurrent abdominal pain. The tumor was characterized by a multinodular plexiform pattern, bland-looking oval to spindle cells, and a myxoid stroma with thin arborizing capillaries. Immunohistochemistry analysis revealed that the tumor cells were positive for smooth muscle actin (SMA) and negative for CD117, DOG-1, CD34, Desmin, progesterone receptor (PR), CD10, S100 and SOX10. A diagnosis of PF was rendered.Conclusion: Gastric PF is a benign tumor without evidence of local recurrence and distant metastasis. This case emphasizes the unique histological appearance and immunophenotype of PF to promote early diagnosis, while endoscopic resection can be used as an alternative treatment for small and superficial PF.