<prompt> CT scan of a patient with history of head injury shows a biconvex hyperdense lesion displacing the greywhite matter interface. The most likely diagnosis isSubdural hematomaDiffuse axonal injuryExtradural hematomaHemorrhagic contusion  <response>: Biconvex hyperdense lesion on CT after a head injury suggest the diagnosis of epidural extradural hematoma. 