Youtor
Colorectal Cancer Screening
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=WWbeQCUh418
Developed and produced by http://www.MechanismsinMedicine.com • Animation description: Screening programs aim to identify individuals with cancers at an earlier stage and allow for treatment before growth and spread has occurred. It also allows for detection of pre-cancerous growths such as polyps before the cancer has even developed. Several screening techniques for colon cancer have been used. • As cancers grow they may bleed. Small amounts of blood are not necessarily visible within the stool. Testing stool samples for occult blood may indicate the presence of a cancer within the colon. Several trials have shown benefit from the use of this test as a screening tool. • This test should be part of a regular exam however it will only detect cancers within the reach of the examining finger [cancers of the mid and lower rectum] • Modern scopes have had several improvements. They are thinner and more flexible with better fibre optics allowing sharper images. In addition the instruments allow the use of additional devices for a variety of functions such as snares for polypectomies, forceps for biopsies and other injection devices. • Flexible sigmoidoscopes are 60 cm long and are able to detect about 65% of all polyps. Upon the discovery of an adenoma, a colonoscopy is usually required to evaluate the proximal bowel. • Case control studies have shown benefit in terms of reduced colon cancer mortality and incidence however they only evaluate the distal end of the colon. • A colonoscopy is the gold standard in terms of screening. A scope enters the rectum and is extended through the entire colon. • This test will identify almost all cancers and most pre-malignant polyps. It also allows for the removal of smaller growths. This test only has to be repeated every 5-10 years if no polyps are present. • Virtual colonoscopy is a new technique that uses computed tomographic or magnetic resonance images to produce computer-generated images of the colon. • Patients still require bowel prep and have air insufflated into their colons. In experienced hands, this test is as good as colonoscopy in detecting cancers and larger polyps.
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