Live Diphyllobothrium Latum during Colonoscopy

A 46-year-old woman presented with a history of 3 days of pruritus in the anal area and 1 day of excretion of tapelike materials. During the year before presentation, she had reported intermittent colicky abdominal pain and loose stool, which had been attributed to irritable bowel syndrome. Laboratory evaluation was unremarkable, with no evidence of anemia. Colonoscopy revealed a long, moving tapeworm, Diphyllobothrium latum, located in the terminal ileum and extending to the sigmoid colon. D. latum is a fi