Asymptomatic anisakiasis of the colon incidentally diagnosed and treatedduring colonoscopy by retroflexion in the ascending colon / Journal of Rural Medicine

<p>A 74-year-old man with diabetes underwent colonoscopy as routine screening for coloncancer. An <i>Anisakis</i> larva was found incidentally during colonoscopy usingthe retroflexion technique in the ascending colon, and was removed using a forceps.Asymptomatic colonic anisakiasis is very rare, and few reports have described diagnosisand treatment of anisakiasis during colonoscopy by the retroflexion technique in theascending colon. We have reported this rare case along with a literature review.</p>

A Case of an Eosinophilic Granuloma Mimicking a Submucosal Tumor in the Ascending Colon Probably Caused by Anisakis / 대한소화기내시경학회지

Anisakiasis in the gastrointestinal tract is caused by the ingestion of raw marine fish that contain Anisakis lavae. In rare cases, Anisakiasis is found as an eosinophilic granuloma that mimics a submucosal tumor. The diagnosis is usually made after surgical resection. Several cases of gastric anisakiasis imitating a submucosal lesion have been reported. However, colonic anisakiasis forming a submucosal lesion is very rare and only a few cases have been reported. All of the cases were confirmed after surgery. Recently, we encountered a male patient with a submucosal lesion on the ascending colon during a health screening. Several biopsies were performed on the same site as the lesion. The pathological finding was eosinophilic granuloma. We tentatively diagnosed the patient with eosinophilic granuloma due to Anisakis as the patient consumed raw seafood and eosinophilia was detected on a laboratory test. We decided not to perform any procedure. One month later, the eosinophilic granuloma disappeared as seen on a follow-up colonoscopy.

Three Cases of Colonic Anisakiasis / 대한소화기내시경학회지

Anisakiasis occurs when humans ingest raw or inadequately cooked saltwater fish or squid that is infested with anisakis larvae. The larvae invade the gastrointestinal mucosa and cause abdominal pain, nausea, vomiting and various gastrointestinal lesions. Anisakiasis of the stomach has been reported occasionally but involvement of the small bowel or colon is extremely rare. We report three cases of anisakiasis in the colon with a brief review of the relevant literature.

A Case of Anisakiasis Concurrently Invading the Stomach, Ileocecal Valve and Transverse Colon / 대한소화기내시경학회지

Anisakiasis of the gastrointestinal tract is caused by the ingestion of raw fish or uncooked foods infested with Anisakis larvae belonging to the subfamily Anisakidae. With the increasing popularity of Japanese cuisine such as sashimi in Korea, the incidence of anisakiasis is expected to increase. The entire gastrointestinal tract from the esophagus to the rectum can be involved. Colonic anisakiasis is rare in comparison with gastric involvement. We report the anisakiasis concurrently invading the stomach, ileocecal valve and transverse colon treated by endoscopy with a brief review of the relevant literature.