Intrahepatic biliary stones

Discussion:

Intrahepatic biliary stones are rare; common location of stone is in large-caliber ducts mostly in the left hepatic lobe or posterior segment of the right hepatic lobe. The intrahepatic biliary strictures may suggest primary sclerosing cholangitis. Biliary strictures are one of the causes of primary intrahepatic bile duct stones.

It's difficult in this case to confirm PV thrombus, as vessels can show artifactual signals due to slow flow and some diseases can make hemodynamic changes like cirrhosis. On such case, if the signal change is well-defined (like the high T2 signal of the portal vein with eccentric flow void), we can suggest partial thrombosis and we need to recommend contrast study for confirmation (CT or MRI) or portal vein Doppler.

Usually, T2 flow void signal is seen at patent vessels, however, it is not alone a sure sign of patency. Signal changes should be seen on at least two MRI sequences to suspect thrombosis. 

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