Research Article
Utility of Endoscopic Examination in the Diagnosis of Acute Graft-versus-Host Disease in the Lower Gastrointestinal Tract
Table 1
Definition and the histological grading system for acute GI GVHD.
| Grade | Histological feature |
| I | Single-cell necrosis (apoptosis) noted on medium power | II | Evidence of epithelial damage by crypt/grandular abscesses, epithelial flattening, or glandular/crypt dilation | III | Dropout of one or more crypts/grands | IV | Total epithelial denudation |
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