Case 5. E. coli-induced xanthogranulomatous colitis (38 y-o F)
         
   
Colon biopsy from a patient with dermatomyositis receiving corticosteroid
   
         
   
Key words : xanthogranuloma, E. coli, steroid
   
         
   
opportunistic infection
   
     
 
     
Xanthogranulomatous reaction seen in the lamina propria mucosae (HE)   E. coli antigens seen in the cytoplasm of the foamy macrophages (immunostaining)