Bleeding between dura & arachnoid membranes due to tearing of bridging veins running between hemisphere & sinuses, resulting in venous bleeding and slow accumulation
Subdural hematoma
Latent interval (lucid) between injury & symptoms onset may be weeks or months
#1 cause is head trauma
Elderly & alcoholics have higher risk because of atrophic brain
Other risk factors: previous head injury, use of anti-thrombotic medications
Presentation of subdural hematoma
Headache
Drowsiness
Confusion
Change in mental function
Focal neuro signs or hemiparesis
Some may present w/ coma
CT finding
Crescent shape hematoma (concave) that crosses sutures
