The 
Image Library
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Anus, Normal Findings
The normal anal region seen through a colonoscope in an inverted position, the colonoscope coming through the anal channel is seen in the picture. The veins are often a little dilated in the distal rectum - in a patient with haemorroids, they are much more dilated.
The anal canal can be easily examined during the passage of the colonoscope through the anus.
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Endoscopy Slide-Shows
Maps, Satellite Images of all Important Conference Cities
April 7, 2007