Asymptomatic Anisakiasis Research Articles

Asymptomatic anisakiasis invading ascending colon after eating mackerel-sushi

Asymptomatic anisakiasis invading ascending colon after eating mackerel-sushi

Asymptomatic Anisakiasis of the Colon Diagnosed and Treated by Colonoscopy

Anisakiasis can involve any part of the digestive tract, but most cases reported have involved the stomach; few reports have described colonic anisakiasis. Furthermore, asymptomatic colonic anisakiasis has been reported to be very rare. A 58-year-old Japanese male asymptomatically received colonoscopy due to a fecal occult blood testing positive, and an Anisakis larva was removed in the ascending colon. After colonoscopy, an detailed questionings concerning eating raw fish revealed that the patient ate the liver of raw filefish 21 days before the colonoscopy. Thus, questionings concerning eating the raw fish were very important and helpful for correct diagnosis. This case report demonstrated that colonic anisakiasis can be diagnosed by colonoscopy before severe complications (intestinal obstruction, perforation, and cancer development) occur. Also, biopsy forceps could be used to remove the Anisakis worms, demonstrating that diagnosis and treatment can be simultaneously performed.

‘Tingling throat syndrome’ as asymptomatic anisakiasis following conveyor belt sushi consumption in Tokyo

‘Tingling throat syndrome’ as asymptomatic anisakiasis following conveyor belt sushi consumption in Tokyo

Asymptomatic anisakiasis of the colon incidentally diagnosed and treated during colonoscopy by retroflexion in the ascending colon.

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

Asymptomatic anisakiasis of the colon incidentally found by colonoscopy.

Asymptomatic anisakiasis of the colon is a rare condition that is difficult to diagnose. A 42-year-old man with no symptoms was referred to our department because of elevated serum carcinoembryonic antigen (CEA) levels detected previously at another hospital. A colonoscopy was performed to find the reason for these elevated CEA levels, and Anisakis larvae were identified by chance in the ascending colon wall. This is only the fourth case of asymptomatic anisakiasis of the colon to be reported worldwide.

A Case of Asymptomatic Anisakiasis of the Colon Successfully Treated by Screening Endoscopic Reject

症例は64歳女性。家族に消化器癌が多いため，上部・下部消化管内視鏡検査を希望され来院された。大腸内視鏡検査で盲腸にアニサキス虫体を認め摘出した。虫体発見より3日前に寿司を摂取していた。大腸アニサキス症は腹痛，下痢などの症状が出現することが多く，無症状で発見されることは稀である。