This video shows a virtual colonoscopy of the rectosigmoid colon performed in a retrograde fashion. There is a 10-mm colonoscopically-proven polyp in the sigmoid colon seen at the top of the frame at the midpoint of the movie. The movie concludes at the tip of the rectal tube which was used to insufflate the colon. CT dataset courtesy of C. Daniel Johnson, MD, Department of Radiology, Mayo Clinic, Rochester, MN.

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