| Summary: | Most of the small-bowel obstructions (SBOs) are the result of adhesions caused by a previous abdominal operation. The commonest previous surgical procedures were colorectal surgery, followed by gynecological surgery, hernia repair, appendicectomy, and cholecystectomy. Etiologies of SBO other than adhesion include organic or abnormal lesions, such as neoplasm, hernias, inflammatory bowel disease, volvulus, intussusception, radiation, intestinal tuberculosis, gallbladder stone, superior mesenteric artery syndrome, and so forth. Under some rare circumstances, SBO may occur without the history of an operation and without radiologic evidence of organic lesions. In such a condition, an accurate diagnosis may be difficult to make, and a timely surgical intervention may be delayed with a result of morbidity or mortality of the patient.
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