Two Cases of Stomach Granuloma Caused by Anisakis-like Larval Nematodes in Japan

Keizo Asami Department of Parasitology, School of Medicine, Keio University, Tokyo, Japan

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Tsutomu Watanuki Department of Parasitology, School of Medicine, Keio University, Tokyo, Japan

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Hazime Sakai Department of Parasitology, School of Medicine, Keio University, Tokyo, Japan

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Hiroshi Imano Department of Parasitology, School of Medicine, Keio University, Tokyo, Japan

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Ryozo Okamoto Department of Parasitology, School of Medicine, Keio University, Tokyo, Japan

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DOI:
https://doi.org/10.4269/ajtmh.1965.14.119
Volume/Issue:
Volume 14: Issue 1
Page(s):
119–123
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Summary

Larval nematodes more than 2 centimeters in length were found in eosinophilic granulomas in the stomach of two patients suffering from acute abdominal symptoms. On the basis of morphological comparison with worms identified as immature Anisakis sp. from the sperm whale, the larva of one case was identified as Anisakis sp., and that of the other was identified as a different but closely related species. Striking features of the larvae were large Y-shaped lateral chords extending into the body cavity, and numerous, high columnar epithelial cells forming the wall of the intestine as well as a large gland-like organ along the esophagus and upper intestine.

The infections presumably were acquired by eating raw fish, a custom that is widespread among the Japanese. It is expected that similar cases may be found among Japanese patients presenting with acute abdominal symptoms.

Author Notes

Department of Pathology, School of Medicine, Tohoku University, Sendai, Japan.

Otaka Municipal Hospital, Otaka-machi, Fukushima, Japan.

Pathology Laboratory, Kitasato Institutes, Minato-ku, Tokyo, Japan.

Copyright:
Copyright © 1965, By The American Society of Tropical Medicine and Hygiene 1965
Published Online:
Jan 1965
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
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