Causes of Intestinal Obstruction - Differential Diagnosis
Lesions Extrinsic to the Intestinal Wall:
 • Adhesions: Postoperative, Congenital, Postinflammatory
 • Hernia: External abdominal wall (congenital or acquired), Internal, Incisional
 • Congenital: Annular pancreas, Malrotation (rotational abnormality), Omphalomesenteric duct remnant
 • Neoplastic: Carcinomatosis, Extraintestinal neoplasm
 • Inflammatory: Intra-abdominal abscess, "Starch" peritonitis
 • Miscellaneous: Volvulus, Gossypiboma, Superior mesenteric artery syndrome
Lesions Intrinsic to the Intestinal Wall:
 • Congenital: Intestinal atresia, Meckel's diverticulum, Duplications/cysts
 • Inflammatory: Crohn's disease, Eosinophilic granuloma
 • Infections: Tuberculosis, Actinomycosis, Complicated diverticulitis, Appendicitis
 • Neoplastic: Primary neoplasms, Metastatic neoplasms
 • Miscellaneous: Intussusception, Endometriosis, Radiation enteropathy/stricture, Intramural hematoma, Ischemic stricture
 • Intraluminal/obturator obstruction: Gallstone, Enterolith, Phytobezoar, Parasite, Swallowed foreign body (magnets, illicit drug mules, sharp objects that perforate the bowel, etc)

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