Intraventricular hemorrhage is bleeding within the cavities of the brain that normally hold clear cerebrospinal fluid (CSF). Such bleeding is frequently associated with pre-term delivery and can result in hydrocephalus and loss of brain tissue.
Intraparenchymal bleeding is within the brain tissue itself and usually results from ruptured arteriovenous malformation (AVM), hemorrhage following ischemic infarction or hypertension.
Subarachnoid hemorrhage usually results from a ruptured surface AVM or cerebral artery aneurysm.
Subdural hemorrhage is the result of trauma leading to disruption of bridging veins between the dura and the brain.