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Corazza-Villanacci classification
| Grade A |
| Nonatrophic, with normal V:C ratio and ↑ IELs (> 25 IELs/100 enterocytes) |
| Grade B1 |
| "Atrophic", V:C < 3:1, but villi still detectable and ↑ IELs (> 25 IELs/100 enterocytes) |
| Grade B2 |
| Atrophic and flat, villi not detectable and ↑ IELs (> 25 IELs per 100 enterocytes) |
V:C: Villous to crypt ratio (normal, V:C > 3:1); GSE: Gluten-sensitive enteropathy; IEL: Intraepithelial lymphocytes.
