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. 2017 Jun 23;8(7):3426–3439. doi: 10.1364/BOE.8.003426

Table 1. Histological grades of disease activity and the corresponding histological features [19].

Grade Disease Activity Histological Features
0 Inactive No extravascular neutrophils
1 Mild Neutrophils in the lamina propria
2 Moderate Cryptitis/crypt abscesses
3 Severe Erosions/ulcers