Total number of lesions | 597 |
Size in millimetres, median (IQR) | 4 (3–6) |
Location, % | |
Proximal colon* | 275 (46.1) |
Ascending segment | 126 (21.1) |
Transverse | 149 (25.0) |
Left colon | 244 (40.9) |
Rectum | 78 (13.1) |
Paris classification, n (%) | |
Protruding lesions | |
0–Ip | 19 (3.2) |
0–Is | 195 (33.1) |
Flat lesions: | |
0–IIa | 281 (47.6) |
0–IIb | 90 (15.3) |
0–IIc | 5 (0.9) |
Kudo pit pattern, n (%) | |
Unable to assess | 116 (19.4) |
I | 235 (39.4) |
II | 188 (31.5) |
IIIL | 37 (6.2) |
IIIs | 11 (1.8) |
IV | 7 (1.2) |
V | 3 (0.5) |
Specific morphological features, n (%) | |
Loss of innominate lines | 272 (45.5) |
Irregular morphology | 84 (14.1) |
Poorly demarcated | 45 (7.5) |
Friability | 26 (4.4) |
Abnormal vascularisation | 26 (4.4) |
Ulcerated surface | 26 (4.4) |
Carpet lesion morphology | 13 (2.2) |
Histology, n (%) | |
Dysplasia | 94 (15.7) |
Invasive cancer | 1 (0.1) |
High-grade dysplasia | 5 (0.8) |
Low-grade dysplasia | 88 (14.7) |
Non-dysplasia | 503 (84.3) |
Postinflammatory polyp | 207 (34.6) |
Hyperplastic polyp | 177 (29.6) |
Sessile serrated adenoma/polyp | 10 (1.7) |
Other† | 109 (18.2) |
*Proximal to splenic flexure (transverse and ascending segments).
†Other: normal mucosa, quiescent inflammation and reparative or scarring mucosal changes.