<prompt> Definite indication of intra -operative cholangiogram is?Preoperative USG showing non dilated CBDUnclear biliary anatomy of the patientAcute cholecystitisCholelithiasis  <response>: IntraPreoperative cholangiography defines the biliary anatomy is mainly used to exclude the presence of stones within the bileduct.In this technique,a catheter can be placed in cystic duct and contrast injected directly into the biliary tree Reference:Bailey Loves manual of surgery,25th edition,page no:1116 