extradural hematoma

epidural haematoma

A medical emergency found in 5 to 15% of fatal head injuries, in which blood accumulates in the epidural space due to blood leaking from a torn or disrupted middle meningeal artery, resulting in compression of the brain/dura mater. It is usually caused by a focal impact—either a fall or a blow to the head. Without urgent evacuation of the haematoma, tentorial herniation ensues, often followed by death.

extradural hematoma

Epidural hematoma Neurology Accumulation of blood in the epidural space, due to leakage of blood from the middle meningeal artery. Cf Subdural hematoma.