Editing Subdural hematoma (section)

{{Short description|Hematoma usually associated with traumatic brain injury}}
{{Infobox medical condition (new)
| name          = Subdural hematoma
| synonyms      = Subdural haematoma, subdural haemorrhage
| image         = Subduralandherniation.PNG
| caption       = Subdural hematoma as marked by the arrow with significant [[midline shift]]
| pronounce     =
| field         = [[Neurosurgery]], [[Neurology]]
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| causes        = [[Head injury]], [[alcoholism]], reduction in [[cerebrospinal fluid]] pressure<ref name=":0" /><ref name="UVT" />
| risks         = [[Senescence]], long-term excessive alcohol consumption, [[dementia]], and [[cerebrospinal fluid leak]]<ref name="wagner" /><ref name=":2" />
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| image_size    = 270
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A '''subdural hematoma''' ('''SDH''') is a type of bleeding in which a [[Hematoma|collection of blood]]—usually but not always associated with a [[traumatic brain injury]]—gathers between the inner layer of the [[dura mater]] and the [[arachnoid mater]] of the [[meninges]] surrounding the [[brain]]. It usually results from rips in [[bridging vein]]s that cross the [[subdural space]].

Subdural hematomas may cause an increase in the [[intracranial pressure|pressure inside the skull]], which in turn can cause compression of and damage to delicate brain tissue. Acute subdural hematomas are often life-threatening. Chronic subdural hematomas have a better [[prognosis]] if properly managed.

In contrast, [[epidural hematoma]]s are usually caused by rips in [[arteries]], resulting in a build-up of blood between the dura mater and the [[skull]]. The third type of brain hemorrhage, known as a [[subarachnoid hemorrhage]] (SAH), causes bleeding into the subarachnoid space between the arachnoid mater and the [[pia mater]]. SAH are often seen in trauma settings, or after rupture of intracranial aneurysms.{{Citation needed|date=January 2023}}

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