EUS access to the biliary tree.

EUS-guided biliary access procedures can target the gallbladder or the bile duct for drainage in selected cases. EUS-guided gallbladder drainage offers comparable results to percutaneous cholecystostomy in high-surgical risk patients with acute cholecystitis refractory to medical treatment. The procedure is not yet widely available. Novel lumen-apposing stents may improve long-term outcomes, resulting in rapid dissemination. EUS access to the bile duct is coupled with ERCP techniques into a hybrid procedure, endosono-cholangiopancreatography (ESCP). ESCP admits six variant approaches to bile duct drainage based on the combination of two access routes (intrahepatic and extrahepatic) with three drainage routes: transmural, retrograde transpapillary and antegrade transpapillary. A thousand ESCP cases have been reported to date with good outcomes. When the expertise is available, ESCP is increasingly replacing percutaneous transhepatic biliary drainage to provide biliary drainage in patients in whom ERCP is not feasible, predominantly in the setting of palliation, but not limited to it.