(Table 151-2 Diseases That Mimic IBD)
Shigella, Salmonella, Campylobacter, Yersinia (acute ileitis), Plesiomonas shigelloides, Aeromonas hydrophila, Escherichia coli serotype O157:H7, Gonorrhea, Lymphogranuloma venereum, Clostridium difficile (pseudomembranous colitis), tuberculosis, amebiasis, cytomegalovirus, AIDS.
Ischemic bowel disease, appendicitis, diverticulitis, radiation enterocolitis, bile salt-induced diarrhea (ileal resection), drug-induced colitis (e.g., NSAIDs), bleeding colonic lesion (e.g., neoplasm), irritable bowel syndrome (no bleeding), microscopic (lymphocytic) or collagenous colitis (chronic watery diarrhea)-normal colonoscopy, but biopsies show superficial colonic epithelial inflammation and, in collagenous colitis, a thick subepithelial layer of collagen; response to aminosalicylates and glucocorticoids variable.