<prompt> A woman presenting with abrupt onset of The Worst headache of her life. Which is the best investigation?NCCT of the headVessel carotid DopplerNo imagingMRI  <response>: MCC of subarachnoid hemorrhage is: TRAUMA- MCC of spontaneous SAH is due to rupture of BERRY ANEURYSM- Classical complaint pts come with is THUNDER CLAP HEADACHE or WORST HEADACHE IN LIFE- IOC for Acute SAH is NCCT- IOC for Chronic SAH is MRI.- IOC to know the cause of SAH is 4 VESSEL ANGIOGRAPHY- for that catheterize 2 ICA and Left Veebral aery. Shows Hyperdensity in Syln fissure Basal cisterns Sulcal Spaces Anterior interhemispheric area 