Case 13. Rotavirus colitis in adult (42 y-o M)
         
    Colon biopsy from an adult patient suffering from hemorrhagic diarrhea (positive for rotaviral antigens in the stool)    
         
   
Key words : rotavirus, colitis, lymphoepithelial lesion
   
     
 
     
Marked infiltration of lymphoid cells both in the lamina propria and within the surface epithelium (HE)   CD20-positive B-cells seen not only in the lamina propria but also among the crypt epithelium (immunostaining)