<prompt> A road traffic accident patient in the casualty is comatose with unilaterally dilated pupil. The NCCT of the patient shows a Lesion peripherally present with concavo - convex border. What is the probable diagnosis?Sub-dural hematomaEpi-dural hematoma,Sub-arachnoid hemorrhageIntra-parenchymal bleeding  <response>: Ans.a. Sub-dural hematomaSub dural hematomaConcavo-convex bleed hyper-densityExtra dural hemorrhageBiconvex flame shaped hyper- densitySub arachnoid hemorrhageIntra-ventricular bleedblood in slyvian fissureIntra -parenchymal bleedMostly a lesion or hyper-density in basal ganglia secondary to hypertension. 