Clinicopathologic Studies on Larval Anisakiasis in Japan

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  • Department of Parasitology, School of Medicine, Chiba University, Chiba, Japan


Ninety-two cases of larval anisakiasis in the gastrointestinal tract of Japanese people, usually with a clinical diagnosis of gastric tumor or acute condition of the abdomen, were studied clinicopathologically, including 19 cases encountered by the authors. Two of these cases are presented, in one of which an intact Anisakis-like larva was found in an eosinophilic phlegmon of the intestine after surgical excision because of abdominal symptoms. On the basis of morphologic comparison with Anisakis larvae collected from mackerel, the worm from the lesion was identified as an Anisakis-like larva. In Japanese people, the infection probably is acquired by eating raw marine fish and squid.