Ultrasound Intrahepatic tumours causing biliary obstruction
Focal masses which cause segmental intrahepatic duct dilatation are usually intrinsic to the duct itself, for example cholangiocarcinoma.
It is also possible for a focal intrahepatic mass, whether benign or malignant, to compress an adjacent biliary duct, causing subsequent obstruction of that segment. This is not, however, a common cause of biliary dilatation and occurs most usually with hepatocellular carcinomas. Most liver metastases deform rather than compress adjacent structures and biliary obstruction only occurs if the metastases are very large and/or invade the biliary tree. A hepatocellular carcinoma or metastatic deposit at the porta hepatis may obstruct the common duct by squeezing it against adjacent extrahepatic structures. Benign intrahepatic lesions rarely cause ductal dilatation, but occasionally their sheer size obstructs the biliary tree.
It is also possible for a focal intrahepatic mass, whether benign or malignant, to compress an adjacent biliary duct, causing subsequent obstruction of that segment. This is not, however, a common cause of biliary dilatation and occurs most usually with hepatocellular carcinomas. Most liver metastases deform rather than compress adjacent structures and biliary obstruction only occurs if the metastases are very large and/or invade the biliary tree. A hepatocellular carcinoma or metastatic deposit at the porta hepatis may obstruct the common duct by squeezing it against adjacent extrahepatic structures. Benign intrahepatic lesions rarely cause ductal dilatation, but occasionally their sheer size obstructs the biliary tree.
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