Injury may be due to secondary processes such as herniation from worsening parenchymal edema ischemia hydrocephalus and progressive or delayed hemorrhage During the subacute phase up to 30 of contusions may cause worsening mass effect w edema from toxic m

Injury may be due to secondary processes, such as herniation from worsening parenchymal edema, ischemia, hydrocephalus, and progressive or delayed hemorrhage. During the subacute phase, up to 30% of contusions may cause worsening mass effect w/ edema from toxic metabolites in surrounding tissue and cerebral autoregulation dysfxn.