The mortality rate from colorectal cancer has been falling for several decades, and many researchers attribute this trend to increased screening, which allows doctors to detect and remove many polyps before they develop into cancer.[2] A polyp can take 10–15 years to develop into cancer, making regular screening a highly effective way to catch developing cancers early. When they are caught early—before they spread beyond their place of origin—about 90% of patients survive for five or more years beyond diagnosis.[3]
Unfortunately, however, only slightly more than half of people get colorectal screening as recommended.[4] The American Cancer Society advises annual screening beginning at age 50 for those at average risk. Those at increased risk, such as people with a family history of colorectal polyps or cancer or a personal history of inflammatory bowel disease, should consult with their doctors to determine the best screening schedule and method for their needs.[5]
The American Cancer Society provides a list of appropriate screening tests to protect yourself against colorectal cancer. Some of these are aimed primarily at finding cancer and others are also targeted at finding precancerous polyps, allowing patients to go longer in between screenings. Below are the types of screening approved by the ACS and how frequently they should be repeated:
CT colonography, more commonly known as virtual colonoscopy, is a less invasive alternative to traditional colonoscopy screening. Following a bowel cleansing regimen, air is gently pumped into the colon via a very small, flexible tube, making it possible to create a CT scan of the rectum, the colon, and its lining, that the radiologist can then examine for signs of polyps and disease. Using CT colonography, the radiologist can also sometimes identify abnormalities, such as cancers or aneurysms, that are located outside the colon. The entire exam takes only about 15 minutes to perform. Unlike traditional colonoscopy, CT colonography doesn’t require sedation, and patients can immediately resume their regular activities immediately following the exam. If polyps are found, then a traditional colonoscopy will be performed to remove them.
Because symptoms often do not appear with the onset of cancer, regular screening is important. If you notice the following symptoms between screenings, consult your doctor.[6]
Iowa Radiology offers CT colonography at our Downtown Des Moines clinic. Feel free to contact us for more information or to schedule an appointment. For more information on CT exams, click the button below.
Some—but not all—insurers cover virtual colonoscopy. We offer a 20% discount for those without insurance coverage for this procedure who pay in full at the time of service.
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[1] “Key Statistics for Colorectal Cancer.” Cancer.org. American Cancer Society, 5 Jan 2017. Web. 2 Feb 2017.
[2] "Colorectal Cancer Facts & Figures 2014–2016.” Cancer.org. American Cancer Society, 2014. Web. 2 Feb 2017.
[3] “The Importance of Colorectal Cancer Screening.” Cancer.org. American Cancer Society, 24 June 2016. Web. 2 Feb 2017.
[4] Ibid.
[5] “Can Colorectal Cancer Be Prevented?” Cancer.org. American Cancer Society, 24 June 2016. Web. 2 Feb 2017.
[6] "Colon Cancer." MayoClinic.org. Mayo Foundation for Medical Education and Research, n.d. Web. 2 Feb 2017.