This article has an accompanying continuing medical education activity, also eligible for MOC credit, on page e65. Learning Objective-Upon completion of this activity, successful learners will be able to name the indication for colonoscopy associated with the lowest rate of adequate colon cleansing; list the indications for colonoscopy associated with the highest adenoma detection rates; name the indication for endoscopic evaluation that has the highest advanced adenoma detection rate; list the indication for colonoscopy associated with the highest colorectal cancer detection rate.

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A 78-year-old man presented with iron-deficiency anemia. Gastroscopy and colonoscopy showed no significant findings. The small intestine was examined via capsule endoscopy, which revealed an Ascaris parasite in the proximal jejunum (left); it was observed for approximately 30 minutes. Distally, in the proximal ileum, a similar but shorter Ascaris could be seen (right). We believe that the difference in the parasites' size was due to a difference in sex-the larger one was probably female. The observation of two adult worms (male and female) in the same host is quite unusual and has been achieved only by capsule endoscopy.

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