Abstract: span>A 79-year-old man
was referred for CT colonoscopy (CTC) following optical
colonoscopy. Unusually, the request was not due to an incomplete
optical colonoscopy. The patient was referred because the
gastroenterologist had identified a large polyp for resection but
was unable to identify its exact location and secure it for
resection during the optical procedure.
What abnormality accounts for the gastroenterologist's difficulty
in identifying the polyp's location?
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