COLON: INFECTIOUS COLITIS (SELF LIMITED COLITIS)

Clasiccallly, no crypt disarray 

the circles indicate neutrophils inside crypts (cryptitis). In the right picture surface neutrophils with damage of epithelium 

No crypt distortion, the right picture indicates neutrophilic infiltration of crypts

The red square and circle  show microabscesses

Left. the red circle shows neutrophil, Right the red arrows indicates severe cryptitis

HISTOLOGICAL FINDINGS OF INFECTIOUS COLITIS:
1.-No crypt disarray or distortion.
2.- Neutrophilic infiltration in crypts (cryptitis) and surface epithelium, sometimes microabscess
3.-Damage of epithelium.

biblio:Odze RD, Goldblum JR: Surgical Pathology of the GI Tract, Liver, Biliary Tract, and Pancreas, 2nd ed. Elsevier: Philadelfia 2009 and Greenson  Diagnostic Gastrointestinal and Liver Pathology ,Lippincott Williams &Wilkins, 2009.