<prompt> Shape of extradural hematoma on NCCT is ?Medially concaveLens shapedBean shapedCrescent shaped  <response>: CT scan head is diagnostic. Extradural haematoma shows biconvex lesion Ref: SRBs Manual of Surgery, 4th Edition, pg. no. 1177 On CT, extradural haematomas appear as a lentiform lensshaped or biconvex hyperdense lesion between skull and brain, constrained by the adherence of the dura to the skull. Ref: Bailey Love Sho Practice Of Surgery, 26th Edition, pg. no. 315 