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CT and MR imaging findings of bowel ischemia from various primary causes Rha SE; Ha HK; Lee SH; Kim JH; Kim JK; Kim JH; Kim PN; Lee MG; Auh YHRadiographics 2000[Jan]; 20 (1): 29-42Ischemic bowel disease represents a broad spectrum of diseases with various clinical and radiologic manifestations, which range from localized transient ischemia to catastrophic necrosis of the gastrointestinal tract. The primary causes of insufficient blood flow to the intestine are diverse and include thromboembolism, nonocclusive causes, bowel obstruction, neoplasms, vasculitis, abdominal inflammatory conditions, trauma, chemotherapy, radiation, and corrosive injury. Computed tomography (CT) or magnetic resonance (MR) imaging can demonstrate the ischemic bowel segment and may be helpful in determining the primary cause. The CT and MR imaging findings include bowel wall thickening with or without the target sign, intramural pneumatosis, mesenteric or portal venous gas, and mesenteric arterial or venous thromboembolism. Other CT findings include engorgement of mesenteric veins and mesenteric edema, lack of bowel wall enhancement, increased enhancement of the thickened bowel wall, bowel obstruction, and infarction of other abdominal organs. However, regardless of the primary cause, the imaging findings of bowel ischemia are similar. Furthermore, the bowel changes simulate inflammatory or neoplastic conditions. Understanding the pathogenesis of various conditions leading to mesenteric ischemia helps the radiologist recognize ischemic bowel disease and avoid delayed diagnosis, unnecessary surgery, or less than optimal management.|*Magnetic Resonance Imaging[MESH]|*Tomography, X-Ray Computed[MESH]|Abdominal Injuries/complications/diagnosis[MESH]|Diagnosis, Differential[MESH]|Digestive System Neoplasms/complications/diagnosis[MESH]|Humans[MESH]|Intestinal Obstruction/complications/diagnosis[MESH]|Intestines/*blood supply/diagnostic imaging/pathology[MESH]|Ischemia/*diagnosis/etiology[MESH]|Mesenteric Vascular Occlusion/complications/diagnosis[MESH]|Vasculitis/complications/diagnosis[MESH] |
