Colon Cancer Screening (cont.)
Dennis Lee, MD
Dennis Lee, MD
Dr. Lee was born in Shanghai, China, and received his college and medical training in the United States. He is fluent in English and three Chinese dialects. He graduated with chemistry departmental honors from Harvey Mudd College. He was appointed president of AOA society at UCLA School of Medicine. He underwent internal medicine residency and gastroenterology fellowship training at Cedars Sinai Medical Center.
In this Article
Virtual colonoscopy is a new technique that uses CT to construct virtual images of the colon that are similar to the views of the colon obtained at colonoscopy. The virtual colonoscopic images are produced by computerized manipulation of two-dimensional images obtained by a CT scanner rather than direct observation through the colonoscope. The colon is cleaned-out using laxatives the day prior to the virtual colonoscopy examination. A tube then is inserted into the anus and is used to inject air into the colon. The CT scans then are performed, and the scans are analyzed and manipulated to form a virtual image of the colon.
Properly performed virtual colonoscopy can be very good. It can even find polyps "hiding" behind folds that occasionally are missed by colonoscopy. Nevertheless, virtual colonoscopy has several limitations. They are:
Because of these limitations, virtual colonoscopy has not replaced colonoscopy as the primary screening tool for individuals at either normal or high risk for polyps or colon cancer. It is currently a good option for individuals who cannot or will not undergo colonoscopy
Medically Reviewed by a Doctor on 4/15/2014
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Colon Cancer Screening - Testing Question: Do you participate in colon cancer screening? What kinds of tests do you have?
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Colon Cancer - Colonoscopy Question: Describe your colonoscopy experience, including removal of polyps and results.
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