BMJ Case Reports 2015; doi:10.1136/bcr-2014-208708

A case of asymptomatic incidental live anisakid worm infestation on a large rectal polyp

  1. Yuko Kitagawa1
  1. 1Department of Surgery, Keio University, Tokyo, Japan
  2. 2Tokyo Medical Center, Tokyo, Japan
  1. Correspondence to Dr Toshio Uraoka, turaoka{at}
  • Accepted 25 December 2014
  • Published 9 February 2015


A 65-year-old man who had been treated for prostate cancer was noted to have an incidental large rectal tumour on surveillance pelvic MRI. He subsequently underwent a colonoscopy that revealed a penduculated tumour in the rectum. When the tumour was inspected closely (figure 1), a white mobile tubular body was noted on the surface of the tumour. It was strongly suspected to be an anisakis worm. After carefully grasping and removing the worm using biopsy forceps, it was found …

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