"Virtual colonoscopy" may be an option, study shows

* Virtual colonoscopy found most, but not all, tumors

* People afraid of colonoscopies might get virtual scan

By Maggie Fox, Health and Science Editor

WASHINGTON, June 16 (Reuters) - So-called virtual colonoscopies -- done using souped-up x-rays -- detect tumors and precancerous lesions almost as well as standard colonoscopies using a camera threaded through the colon, Italian researchers reported on Tuesday.

The virtual procedure, done using computed tomography scans, might offer an alternative for people who are embarrassed or afraid to have a standard colonoscopy and encourage them to be examined, Dr Daniele Regge of the Institute for Cancer Research and Treatment in Turin, Italy, and colleagues said.

Their study, published in the Journal of the American Medical Association, adds to a growing body of evidence showing the CT procedures are safe and almost as good as standard colonoscopies.

Colon cancer is the second-biggest cancer killer in most countries, after lung cancer.

It is easily detected at earlier and more treatable stages using colonoscopy -- a tiny camera threaded up through the rectum. The device has a little pair of clippers on the end to remove suspicious-looking growths called polyps so they can be tested to see if they might become cancerous.

U.S. health experts recommend regular colonoscopies for people starting at age 50 and the practice is credited with helping to lower the number of deaths from colon cancer from around 52,000 in 2007 to just under 50,000 people this year in the United States.

But only about half of those who should get them do, in part because the procedure is embarrassing, uncomfortable and can, in rare cases, cause injury.

'APPEALING SOLUTION'

Regge's team tested more than 1,000 people, giving each both a real and virtual colonoscopy on the same day.

The x-rays found 151 of the 177 patients who had advanced neoplasia -- the lesions most likely to become tumors if not removed.

"CT colonography detected 39 of 41 participants with cancer, including all 3 with diameters of 6 to 9 mm," they wrote.

If the CT scan finds a polyp or tumor, the patients must have a standard colonoscopy to get a sample, but people who are cleared can escape being sedated and having the procedure.

With either procedure, patients must take strong laxatives and the virtual procedure requires having some air puffed into the colon, so it is not entirely comfortable, either.