A large heterogeneous mass with central high attenuation involves the transverse mesocolon. Active extravasation of intravenous contrast (arrows) indicates active hemorrhage. The adjacent bowel is normal in appearance.
► Mesenteric bleeding: suggested in the setting of blunt abdominal trauma, high attenuation fluid and active extravasation within a mesentery. If the CT scan had been performed with bowel contrast, a bowel perforation would have been a possibility; free air would most likely be present.
Mesenteric hemorrhage in the setting of blunt trauma is uncommon. When detected, reporting the severity of the hemorrhage and the presence or absence of significant bowel injury (laceration, perforation, or ischemia) is critical to triage patients to surgical intervention or observation. Mesenteric hematomas tend to be focal, well-defined masses that are the result of mesenteric vascular laceration. They may be triangular, round, or oval in shape. Acute hemorrhage is generally high in attenuation (50 to 60 HU) and becomes less attenuating over time. The finding of intravenous contrast extravasation in the region of the hematoma is indicative of active bleeding. Irregularity of the mesenteric vessels, often termed mesenteric beading, and abrupt termination of vessels may also indicate mesenteric vascular injury. In some cases, the hemorrhage in the mesentery is less well defined such that the mesentery appears hazy, infiltrated, or indistinct.
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