the emergency room because of bilious vomiting and intense epigastric pain. She was unable to tolerate liquids and had moderate signs of dehydration. She had eaten raw fish (sushi) the day before. The patient was hospitalized and rehydrated. She stopped vomiting but the epigastric pain was not controlled. She underwent upper gastrointestinal endoscopy which revealed numerous erosions and ulcers in the gastric body. A parasite with the appearance of an adult Anisakis was found adherent to and penetrating the central part of an ulcer. It was withdrawn with a polypectomy snare. There was a rapid relief of symptoms. The parasitolo− gy report identified Anisakis simplex (l" Fig. 1). Anisakiasis is related to the ingestion of raw or undercooked fish and occurs in Japanese culture (sushi, sashimi), areas in South America (“ceviche”), Spain (“vin− egar anchovies”) and the Netherlands (raw fish) [1]. Anisakiasis can become a serious clinical problem when it causes gastric involve− ment, with ulcerations, pain and, rarely, intramural pseudotumors. Gastric in− volvement occurs in 90 % of cases. When upper gastrointestinal endoscopy is per− formed 1 or 2 days after infection, the en− doscopic findings are of redness and ero− sions or ulcerations at the site of penetra− tion of the gastrointestinal wall (l" Fig. 2) [2]. Steroid treatment often solves the crisis, but only expulsion of the worm or its endoscopic removal with a biopsy for− ceps calms the pain [3] (l" Fig. 3). The best solution to anisakiasis in humans is to prevent it by avoiding water contami− nation and by freezing fish that is to be eaten raw at ± 20 8C for at least 5 days or at ± 35 8C for 15 h. Endoscopy_UCTN_Code_CCL_1AB_2AD_3AF