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©The Author(s) 2025.
World J Gastrointest Endosc. Sep 16, 2025; 17(9): 109144
Published online Sep 16, 2025. doi: 10.4253/wjge.v17.i9.109144
Table 1 Morphological classification of polyps
Endoscopic appearance
Paris class
Description
Protruded lesionsIpPedunculated polyps
IspSemi-pedunculated polyps
IsSessile
Flat elevated lesions0-IIaFlat elevation of mucosa
0-IIa/cFlat elevation with central depression
Flat lesions0-IIbFlat mucosal change
0-IIcMucosal depression ≤ 1.2 mm
0-IIc/IIaMucosal depression with raised edge
Excavated lesions0-IIIMucosal depressions > 1.2 mm


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