<prompt> Subdural Hematoma SDH is caused byBridging veinsCaroticocavemous fistula ruptureMiddle meningeal arteryNone  <response>: A Bridging veins SUBDURAL BLEEDING arises from rupture of cortical vesselsbridging veins. Relatively severe trauma No lucid interval Diffuse concave lesion on computed tomography Require immediate transfer to a neurosurgical unit for decision on evacuation 50 per cent mortality. 