Cancer

Unrestricted diet OK more than one day before colonoscopy

(HealthDay)—Unrestricted diets are acceptable more than one day before colonoscopy among patients using a split-dose bowel regimen, according to a study published in the October issue of Gastrointestinal Endoscopy.

Cancer

When is a colonoscopy necessary?

A recent study found around 30% of all procedures performed in a New South Wales hospital were either unhelpful or harmful. Some of these, which included performing a colonoscopy for constipation, were becoming more prevalent.

Cancer

Q&A: Pain management during colonoscopy

Dear Mayo Clinic: I just turned 50, and my health care provider recommends that I get a colonoscopy to screen for colon cancer. I want to have the test done, but as a recovering addict, I don't want pain medication. Is this ...

Diseases, Conditions, Syndromes

Post-endoscopic infection more common than previously thought

(HealthDay)—The rates of post-endoscopic infection within seven days vary from 1.1 per 1,000 procedures for screening colonoscopy to 3 per 1,000 procedures for osophagogastroduodenoscopies (OGDs), according to a study published ...

Other

Blue dye tablet helps identify polyps during colonoscopy

Ingestion of a blue dye tablet during bowel prep for colonoscopy could be a significant advance in the early detection of colorectal cancer (CRC). When used in conjunction with colonoscopy, the blue dye increased adenoma ...

Cancer

Colon polyp type may be key to cancer risk

(HealthDay)—The type of colon polyp that's spotted during a colonoscopy may help predict the likelihood of colon cancer, new research shows.

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Colonoscopy

Colonoscopy is the endoscopic examination of the large colon and the distal part of the small bowel with a CCD camera or a fiber optic camera on a flexible tube passed through the anus. It may provide a visual diagnosis (e.g. ulceration, polyps) and grants the opportunity for biopsy or removal of suspected lesions.

Virtual colonoscopy, which uses 2D and 3D imagery reconstructed from computed tomography (CT) scans or from nuclear magnetic resonance (MR) scans, is also possible, as a totally non-invasive medical test, although it is not standard and still under investigation regarding its diagnostic abilities. Furthermore, virtual colonoscopy does not allow for therapeutic maneuvers such as polyp/tumor removal or biopsy nor visualization of lesions smaller than 5 millimeters. If a growth or polyp is detected using CT colonography, a standard colonoscopy would still need to be performed.

Colonoscopy can remove polyps as small as one millimeter or less. Once polyps are removed, they can be studied with the aid of a microscope to determine if they are precancerous or not.

Colonoscopy is similar to but not the same as sigmoidoscopy, the difference being related to which parts of the colon each can examine. While colonoscopy allows an examination of the entire colon (measuring four to five feet in length), sigmoidoscopy allows doctors to view only the final two feet of the colon. A sigmoidoscopy is often used as a screening procedure for a full colonoscopy, in many instances in conjunction with a fecal occult blood test (FOBT), which can detect the formation of cancerous cells throughout the colon. Other times, a sigmoidoscopy is preferred to a full colonoscopy in patients having an active flare of ulcerative colitis or Crohn's disease to avoid perforation of the colon. Additionally, surgeons have lately been using the term pouchoscopy to refer to a colonoscopy of the ileo-anal pouch.

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