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
Flexible sigmoidoscopy utilizes a flexible sigmoidoscope, a flexible, fiberoptic viewing tube with a light at the tip. It is inserted through the anus and is used by the doctor to examine the rectum and the part of the colon adjacent to the rectum. It is a shorter version of a colonoscope. Approximately 50% of colorectal cancers and polyps are found to be within the reach of a flexible sigmoidoscope. It is recommended that individuals of average risk for colon cancer undergo a flexible sigmoidoscopy examination at age 50 and every 3-5 years thereafter. If polyps are found during a flexible sigmoidoscopic examination, a colonoscopy to examine the entire colon is recommended to remove the polyps as well as to find and remove additional polyps in other parts of the colon. The removed polyps are examined by a pathologist under a microscope to determine if the polyps are benign, malignant or pre-cancerous. Individuals with precancerous polyps (adenomas and villous adenomas) have a higher than average risk of developing colon cancer, and it is recommended that they return periodically for surveillance colonoscopies (see below). For more information about this procedure, please see the Flexible Sigmoidoscopy article.
Many doctors in the US are recommending screening colonoscopies rather than flexible sigmoidoscopies for healthy subjects with an average risk for developing colon cancer. Colonoscopies are recommended beginning at the age of 50 and thereafter every 7-10 years if no colon polyps or cancers are found. The rationale for this recommendation is:
For more information about this procedure, please see the Colonoscopy article.
Medically Reviewed by a Doctor on 9/24/2015
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