Extradural hematoma (hyperacute)

Discussion:

It is important to remember that hyperacute hemorrhage is isodense to intravascular blood. In this case there are areas of clot retraction anteriorly. Other causes of a swirled or low density extradural hematoma are presence of dural tear with admixing of CSF with blood, anticoagulants, and low hematocrit. 

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