TABLE 1.

Histological grading of colitis according to Dieleman et al. (13)

Feature gradedGradeDescription
Inflammation0None
1Slight
2Moderate
3Severe
Extent0None
1Mucosa
2Mucosa and submucosa
3Transmural
Regeneration4No tissue repair
3Surface epithelium not intact
2Regeneration with crypt depletion
1Almost complete regeneration
0Complete regeneration or normal tissue
Crypt damage0None
1Basal one-third damaged
2Basal two-thirds damaged
3Only surface epithelium intact
4Entire crypt and epithelium lost
% Involvement11-25
226-50
351-75
476-100