<prompt> Ramu, presents with recurrent attacks of cholelithiasis, US examination shows a dilated CBD of 1 cm. The next line of management is -ERCPPTCCholecystostomyIntravenous cholangiogram  <response>: The first inv. for any pt. with cholelithiasis or jaundice is US.Next inv. depends on US findings,If the intrahepatic ducts are dilated without any extrahepatic dilatitionthen the preferred inv. is PTCIf the dilatation is in CBD ERCP.ERCP may provide direct diagnosis of the distal CBD pathology and may be therapeutic as well for a C stone or stricture. 