The provider examines the portion of the colon that remains after a colon removal procedure using a colonoscope, a tubular instrument with a light source and camera. He inserts the scope through a previously placed colostomy stoma, the opening on the skin of a surgically created passageway into the colon. He looks for signs of recurrent disease, such as cancer. He takes samples of any suspicious tissue by brushing or washing the area to collect cells for laboratory analysis.
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