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Table 1 Histological classifications commonly used for celiac disease

From: An updated overview of spectrum of gluten-related disorders: clinical and diagnostic aspects

  HISTOLOGICAL CRITERIA   MARSH MODIFIED (OBERHUBER) CORAZZA
Increased intraepithelial lymphocytes (> 40% for Marsh, > 25% for Corazza) Crypt hyperplasia Villous atrophy   
No No No Type 0 None
Yes No No Type 1 Grade A
Yes Yes No Type 2  
Yes Yes Yes (partial) Type 3a Grade B1
Yes Yes Yes (subtotal) Type 3b  
Yes Yes Yes (total) Type 3c Grade B2