The provider examines the part of the colon that includes the rectum, sigmoid, descending, transverse, or ascending colon, and cecum using a colonoscope, a long, thin flexible tubular instrument with a light source and camera. He uses a channel in the scope to introduce an ultrasound probe and performs an ultrasound examination of the colon. This endoscopic ultrasound examination helps the provider diagnose and stage colon cancer.
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