<prompt> Head injury, worrisome and should require CT imaging is:Antegrade amnesia for more than 30 minutesConcussion and memory lossOne episode of Projectile vomitingOption not recalled  <response>: Ans. A. Antegrade amnesia for more than 30 minutesExplanationThis question is directly adapted from a table in Love and Bailey, which mentions all indications of CT scan in case of head injuryNational Institute for Health and Clinical Excellence NICE guidelines for computed tomography CT in head injury.GCS 13 at any pointGCS 13 or 14 at 2 hoursFocal neurological deficitSuspected open, depressed or basal skull fractureMore than one episode of vomitingAny patient with a mild head injury over the age of 65 years or with a coagulopathy, for instance warfarin use, should be scanned urgentlyDangerous mechanism or injury or antegrade amnesia 30 minutes warrants CT within 8 hours 