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The nonpolypoid colorectal neoplasms (NP-CRNs) are relatively common in patients with gastrointestinal alarm systoms. The depressed lesions have a greater risk of having cancer than flat and polypoid lesions.
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Inclusion Criteria:
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consecutive adult patients undergo colonoscopy by one endoscopist from Jan 2009 to Dec 2010
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All the lesions will be removed endoscopically or surgically and examined histologically by an independent gastrointestinal pathologist.
Histological diagnosis is determined according to the World Health Organization (WHO) criteria.Pedunculated lesions are categorized according to Haggitt's classification.