Epidural hematoma is defined by which of the following?

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Epidural hematoma occurs when arterial blood accumulates in the epidural space, which is between the skull and the dura mater. This is most often due to injury to a meningeal artery (classically the middle meningeal artery) after a head trauma. The arterial source and the confined space mean the bleed expands rapidly, leading to quick neurological deterioration if not treated promptly. This distinguishes it from other bleeds: bleeding into the subarachnoid space is a subarachnoid hemorrhage, bleeding within brain tissue is intraparenchymal hemorrhage, and a venous bleed between skull and dura would not fit the usual arterial epidural pattern.