<prompt> Investigation of choice for Acute cholecystitis is:H.I.D.A ScanUSGCT ScanBiopsy  <response>: IOC for Acute Cholecystitis: USG USG is the IOC for most GB pathologies Most Accurate Investigation for Acute Cholecystitis: H.I.D.A Scan H.I.D.A is used for equivocal cases where USG is not conclusive IOC for Abdominal trauma :CECT 