posterior fossa<unk>  bleeds are the second most common cause of stroke, accounting for 10% of hospital admissions for stroke. High blood pressure raises the risks of spontaneous<unk>  by two to six times. More common in adults than in children, intraparenchymal bleeds are usually due to penetrating head trauma, but can also be due to depressed skull fractures. Acceleration-deceleration trauma, rupture of an aneurysm or arteriovenous malformation (AVM), and bleeding within a tumor are additional causes. Amyloid angiopathy is not a uncommon cause of<unk>  in patients over the age of 55. A very small proportion is due to cerebral venous sinus thrombosis. Risk factors for<unk>  include: * Hypertension (high blood pressure) * Diabetes mellitus * Menopause * Excessive alcohol consumption * Severe migraine Cigarette smoking may be a risk factor but the association is weak. Traumautic<unk>  hematomas are divided into acute and delayed. Acute<unk>  hematomas occur at the time of the injury while delayed<unk>  hematomas have been reported from as early as 6 hours post injury to as long as several weeks.
Intracerebral hemorrhage
Stroke
Subarachnoid hemorrhage
Cerebral edema  Cerebral edema  1
Epidural hematoma
Intracranial hemorrhage
Subdural empyema
Brain herniation