Subacute subdural hematoma


Subdural hematomas are mainly due to rupture of bridging cortical veins following trauma. They have a crescent shape and cross the cranial sutures. Large hematomas can cause mass effect as in this case. 

The age of the blood on CT can be estimated as acute (hyperdense), subacute (isodense) and chronic (hypodense) relative to adjacent gray matter.