胃の寄生虫性肉芽腫とInflammatory fibroid polypが併存した1例

Abstract

A 52-year-old woman with the habit of eating raw cuttlefish visited our hospital complaining of epigastric pain. Gastroendoscopy revealed a whitish protruding lesion 20mm in diameter on the anterior wall of the angulus. Two months later, the appearance changed to a submucosal tumor with erosion on the top. Spindle cell sarcoma was suspected histologically by the biopsy specimen. Preoperative gastroendoscopy revealed a submucosal tumor on the greater curvature of the gastric antrum in addition to that on the anterior wall of the angulus. The tumor was surgically resected. We histologically diagnosed this lesion as parasitic granuloma due probably to anisakiasis infection for the former and inflammatory fibroid polyp (IFP) for the latter. This is a rare case report of IFP associated with parasitic granuloma. Concomitant presence of IFP in the neighborhood of parasitic granuloma due probably to anisakiasis suggests that infestation by a parasite larva including Anisakis nematode play an important role in the pathogenesis in some cases of IFP.