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Haematoma collecting, usually following trauma, between the meningeal and arachnoid layers of the dura.
May cross sutures but not dural attachments.
Bilateral subdural haematomas are less common than unilateral.
Subdurals may contain: hyperacute, acute, subacute and chronic haematoma
Half of subdural haematomas are due to rupture of a bridging vein and the other half due to torn cortical arteries.