Table 2

Baseline endoscopic and histological lesion characteristics

Total number of lesions597
Size in millimetres, median (IQR)4 (3–6)
Location, %
 Proximal colon*275 (46.1)
 Ascending segment126 (21.1)
 Transverse149 (25.0)
 Left colon244 (40.9)
 Rectum78 (13.1)
Paris classification, n (%)
 Protruding lesions
  0–Ip19 (3.2)
  0–Is195 (33.1)
 Flat lesions:
  0–IIa281 (47.6)
  0–IIb90 (15.3)
  0–IIc5 (0.9)
Kudo pit pattern, n (%)
 Unable to assess116 (19.4)
 I235 (39.4)
 II188 (31.5)
 IIIL37 (6.2)
 IIIs11 (1.8)
 IV7 (1.2)
 V3 (0.5)
Specific morphological features, n (%)
Loss of innominate lines272 (45.5)
Irregular morphology84 (14.1)
Poorly demarcated45 (7.5)
Friability26 (4.4)
Abnormal vascularisation26 (4.4)
Ulcerated surface26 (4.4)
Carpet lesion morphology13 (2.2)
Histology, n (%)
 Dysplasia94 (15.7)
  Invasive cancer1 (0.1)
  High-grade dysplasia5 (0.8)
  Low-grade dysplasia88 (14.7)
 Non-dysplasia503 (84.3)
  Postinflammatory polyp207 (34.6)
  Hyperplastic polyp177 (29.6)
  Sessile serrated adenoma/polyp10 (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.