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Localized clotted blood as evidence of visceral trauma on CT: the sentinel clot sign.
AJR. American Journal of Roentgenology 1989 October
We retrospectively reviewed the CT scans of 116 patients with abdominal trauma who had visceral injuries to determine if identification on CT of focal high-density clotted blood (a "sentinel clot") was an accurate sign of injury to an adjacent organ. The sentinel clot sign was sensitive, present in 101 (84%) of 120 visceral injuries with only three false-positive cases. Whereas CT visualized the visceral injury itself in 86% of cases, the sentinel clot was the only clue as to the source of hemorrhage in 14% of the cases. Splenic and bowel/mesenteric injuries were frequently subtle, and the focal clot helped to focus attention on the traumatic lesion. In 9% of splenic trauma cases and 32% of bowel/mesenteric injuries, the sentinel clot was the only positive finding. Localized clot is a frequent and accurate sign of injury to an adjacent organ. By facilitating diagnosis of trauma to a specific organ, it may influence the management decision of surgical vs conservative therapy.
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