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. 2019 Nov 28;69(3):411–444. doi: 10.1136/gutjnl-2019-319915
Normal ampulla Minor polyposis Major polyposis
Ampulla size n/a Less than 1 cm More than 1 cm
Villous histology n/a None Present
Degree of dysplasia n/a Mild Moderate or severe
Recommended surveillance 5 yearly 3 yearly Annual