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Retroperitoneal or mesenteric hemorrhage is mainly caused by clinical trauma. Spontaneous retroperitoneal or mesenteric hemorrhage is rarely seenin the root of the small bowel mesentery. In this report,we describe ultrasonography (US) and computed tomography (CT) findings in arecently encountered case of spontaneous hematoma in the root of the small bowel mesentery, and discuss the diagnostic utility of these imaging techniques in patient management. The clinical and imaging characteristics of retroperitoneal or mesenteric hematoma are briefly reviewed.rn