- Epidural hematoma → head trauma followed by brief loss of consciousness, then normal state (lucid interval), followed by new focal neurologic deficits (decreasing consciousness, ipsilateral pupil dilation, emesis) due to middle meningeal artery damage causing bleed and increased intracranial pressure; biconvex/lentiform shape of bleed on CT, with no crossing of suture line but can cross midline
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