Aim. to identify and study endoscopic various diagnostic criterias of sessile serrated lesions (SSLs) without displasia.Materials. We included 158 patients 44 (27.8%) men and 114 (72.2%) women aged 17 to 81 (mean age 52.1±3.4), in whom 215 SSLs were detected. All lesions were endoscopically removed and pathological examination.Results. The SSLs were located in the right colon - 177/215 (82.3%), in the left colon - 38/215 (17.7%). The size was 2-25 mm, the majority (165/215 (76.7%)) were 6-15 mm; the color of the SSLs was white - 107/215 (49.7%) or similar to the surrounding mucosa - 104/215 (48.4%), rarely red - 4/215 (1.9%). The surface was most often smooth - 103/215 (47.8%), less often cloud-like 58/215 (27.0%); the borders of the SSLs were distributed equally - serrated 202/215 (93.9%); more often there were irregular shaped SSLs - 139/215 (64.8%), to a lesser extent oval (61/215 (28.3%) and round shape 15/215 (6.9%); a «mucinous cap» on the surface was in 190/215 (88.4%), which was washed off well in 134/215 (62.3%), and in 25/215 (11.6%) cases it was absent. According to the Paris classification SSLs were the type 0-IIa - 192/215 (89.3%), less common were type 0-Is 20/215 (9.5%), type 0-Is+IIc 3/215 (1.2%), type 0-IIb 1/215 (0.4%), type 0-IIa+IIc 3/215 (1.2%); according to the NICE and JNET classifications in all cases SSLs were type 1 - 215/215 (100%). According to the Kudo classification was type II - 158/215 (73.6%), with specific sign according to Kimura type II-O - 48/215 (22.0%), in rare cases according to Kimura type IIL 9/215 (4.4%) were presented; capillary pattern in all 215/215 (100%) cases is not dilated, regular, type 1 according to Y. Sano.Conclusion. Sessile serrated lesions (SSLs) without displasia can be varied, not only with the usual and well-known features. The use of an extended set of endoscopic criterias contribute accurate verification of SSL during colonoscopy.