<prompt> After head injury, biconvex, lenticular shape hematoma in CT scan is characteristic of which of the following :Extradural haemorrhageSubdural haemorrhageIntracerebral hematomaDiffuse-axonal injury  <response>: Ans ie a ie Extradural haemorrhage Ref. : Chapman, 3e, p438CT scan non-contrast is the best diagnostic method to evaluate a head injury pt. better than MRIOn CT scan -Extradural haemorrhage appears as biconvex lentiform opacity. Subdural haemorrhage appears as concavoconvex crescentic opacity. Intracerebral blood appears on small foci, typically at greywhite matter interface, or more centrally in the white matter. 