Percutaneous transhepatic biliary drainage is an interventional radiology procedure undertaken for those with biliary obstruction.
It is almost exclusively performed in those with a malignant obstruction, such as cholangiocarcinoma, ampullary and pancreatic malignancies when retrograde access via endoscopic retrograde cholangiopancreatography (ERCP) is not amenable.
It is commonly undertaken as part of a palliative biliary stent insertion. Rarely, it is used in the treatment of benign strictures.
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