portant to recognize that even small polyps can infrequently harbor
early or advanced cancer. Follow up CT examinations will also expose
patients to cumulative doses of radiation. Data published in the New
England Journal of Medicine (Nov. 29, 2007), pointed to the potential
dangers of radiation exposure over a person's lifetime from diagnostic
medical testing using CT scans. Recent articles in Time (June 27, 2008) and
the New York Times (June 29, 2008) also noted the radiation risks of CT
scans. CT colonography could negatively impact the cost-effectiveness of
colorectal cancer screening, as each positive CT colonography will require
a subsequent colonoscopy.
"ASGE supports colonoscopy for colorectal cancer screening because it
offers the advantage of allowing for detection and prevention through the
removal of polyps during the same procedure, without unnecessary radiation
exposure. Colonoscopy also has a high detection rate for polyps of all
sizes and is the only method that allows us to remove polyps before they
turn into cancer," said Petrini.
According to a study released in October 2007 from the Centers for
Disease Control and Prevention and the American Cancer Society, colorectal
cancer deaths dropped nearly 5 percent between 2002 and 2004, more than the
other major cancer killers (prostate, breast, lung). Among the key factors
playing a role in the decline was prevention through screening and the
removal of precancerous polyps. This is excellent news and reinforces the
importance of colorectal cancer screening beginning at age 50, or even
younger if there is a family history of colorectal cancer or polyps.
If CT colonography is a method patients are considering, they must
understand its limitations:
-- Requires the same bowel prep as colonoscopy.
-- Does not detect small polyps.
-- Does not have the ability to remove polyps.
-- Requires the insertion of a small tube in the rectum and insufflation of
Page: 1 2 3 4 5 Related medicine technology :1
|SOURCE American Society for Gastrointestinal Endoscopy|
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