<unk> s, or<unk><unk>  hematomas, are a subtype of<unk> cranial hemorrhage that occur within the brain tissue itself.<unk> s are potentially deadly because they can increase<unk> cranial pressure and crush delicate brain tissue or reduce its blood supply, causing ischemia.  The other category of<unk> cranial hemorrhage is extra-axial hemorrhage, such as epidural, subdural, and subarachnoid hematomas, which all occur within the skull but outside of the brain tissue.
Intra-axial hemorrhage
Extra-axial hemorrhage
Epidural hematoma
Intraventricular hemorrhage
Intraparenchymal hemorrhage
Brain herniation
Subdural empyema
Hydrocephalus