Abstract
A 57-year-old man was admitted to the hospital because of abdominal pain and fullness developed after he had eaten sliced mackerel soaked in vinegar and grifola frondosa, a kind of mushroom ‘maitake’, a few days before admission. An emergency operation was performed with a diagnosis of acute abdomen with ileus. Serosal inflammation with petechial hemorrhage of the ileum 100cm to the end of ileum and moderate ascites were found. Because some elastic soft masses were felt in the stenosed ileum, partial resection of the ileum was performed. Grossly, the ileal stricture and a larva of the family Anisakidae which penetrated into the mucosa were confirmed and grifola frondosa were incarcerated in the ileum. Thus the diagnosis of dietetic ileus with anisakiasis of the small intestine was made.
