How should endoscopic surveillance be performed in patients with UC and Crohn’s disease

How should endoscopic surveillance be performed in patients with UC and Crohn’s disease? 

Surveillance colonoscopy should be performed in patients with UC or extensive Crohn’s disease every 1 to 2 years beginning 8 to 10 years after the clear onset of disease symptoms. During the colonoscopy, four-quadrant biopsy samples should be obtained every 10 cm from the cecum to the rectum (minimum of 32 biopsy samples) in these patients. Biopsies targeted at macroscopically involved segments may be adequate for endoscopic surveillance in patients with less extensive colitis.

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