Why it's doneBy Mayo Clinic Staff
Virtual colonoscopy is used to screen for colon cancer in people who are at least 50 years old and at average risk for the disease. Studies have shown that virtual colonoscopy has detection rates similar to colonoscopy for cancer and most types of polyps. Similarly, virtual colonoscopy is as accurate as colonoscopy for people at average risk of colon cancer, including people over age 65.
Virtual colonoscopy also screens for an enlargement of the major blood vessel in the abdomen (abdominal aortic aneurysm).
Your doctor may suggest virtual colonoscopy if you:
- Are reluctant to have colonoscopy
- Are at risk for colonoscopy complications, such as excess bleeding because blood that doesn't clot normally
- Have a bowel obstruction
You aren't a candidate for virtual colonoscopy if you have:
- A history of colon cancer or abnormal tissue clumps (polyps) in your colon
- A family history of colon cancer or colon polyps
- Chronic inflammatory bowel disease (Crohn's disease or ulcerative colitis)
- Acute diverticulitis
Because virtual colonoscopy provides images of the entire abdominal and pelvic area, problems unrelated to colon cancer — such as a kidney tumor — might be found as well. Virtual colonoscopy may also be used to monitor small or very small polyps.
Insurers vary in their coverage of virtual colonoscopy. Coverage should be checked before scheduling the procedure.
June 09, 2014
- AskMayoExpert. What is computed tomography (CT) colonography? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
- Kruskal JB, et al. Computed tomographic colonography. http://www.uptodate.com/home. Accessed Feb. 20, 2014.
- Yee J, et al. The time has arrived for national reimbursement of screening CT colonography. AJR. American Journal of Roentgenology. 2013;201:73.
- Pickhardt PJ, et al. Colorectal cancer: CT colonography and colonoscopy for detection — Systematic review and meta-analysis. Radiology. 2011;259:393.
- Sakamoto T, et al. Detection of flat colorectal polyps at CT screening colonography in comparison with conventional polypoid lesions. Acta Radiologica. 2012;53;714.
- Johnson CD, et al. The national CT colonography trial: Assessment of accuracy in participants 65 years of age and older. Radiology. 2012;263:421.
- Virtual colonoscopy. National Institute of Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.6.gov/ddiseases/pubs/virtualcolonoscopy. Accessed Feb. 20, 2014.
- Pooler BD, et al. Screening CT colonography: Multicenter survey of patient experience, preference, and potential impact on adherence. AJR. American Journal of Roentgenology 2012;198:1361.