Gastronews - virtual colonoscopy: does it work? Home - gastronews en español about gastronews go to gastrocare contact us index - this issue: colorectal cancer and screening new screening technique: "virtual colonoscopy" - does it work? viagra generic The american cancer society does not recommend virtual colonoscopy for early detection of colorectal cancer. Virtual colonoscopy (ctc): we’ve recently been bombarded with commercials for the new computed tomographic colonography (ctc), also called “virtual colonoscopy. ” ctc uses the same technology as cat scans (computer assisted tomography) to produce three-dimensional images of the inside of the colon. Advertising misleadingly suggests that ctc is less invasive than colonoscopy because images are taken from outside the body. But from the patient’s point of view, this test is similar to a barium enema. The same full bowel cleansing is required for both. do most health insurance plans cover viagra During the procedure, a tube is used to pump air into the rectum, blowing up the colon like a balloon to allow scanning. Considerable cramping is experienced without any relief from sedation. was kostet viagra 10 mg Some radiologists assert that ctc is as effective as colonoscopy in detecting colon polyps. But, studies have found it to be significantly inferior. Many false positives require a colonoscopy, and many false negatives potentially miss a polyp that could be or could become cancer, especially if the scan is not done in an expert center with 3-d scanners, rather than the usually available 2-d scanners. generic viagra overnight delivery Another drawback of ctc concerns the removal of polyps. Gastroenterologists finding a polyp during a colonoscopy can remove it during the same procedure. buy generic viagra online But if polyps are found during ctc, you must undergo a colonoscopy anyway. viagra jelly banana Thirty to 60% of patients having a ctc must also have a colonoscopy. order viagra online Ctc is simply not as effective as colonoscopy. These are the drawbacks that prevent it from being a recommended screening tool: drawbacks of virtual colonoscopy (ctc) diagnostic only: virtual colonoscopy (ctc) cannot remove polyps or even biopsy anything suspicious. what are the effects of viagra on young men Uncomfortable: ctc will inevitably be uncomfortable as compared to colonoscopy, which is rarely uncomfortable in the right hands, and is usually done with sedation anyway. generic viagra canada False-positives: false-positive resul. viagra jelly banana