Preoperative Biliary Drainage (PBD)
ProcedureEndoscopic retrograde biliary drainage (ERBD) and stent placement was the first choice for PBD while ultrasound-guided percutaneous transhepatic biliary drainage (PTBD) was done if ERBD was not feasible. Biliary drainage was considered successful if the serum bilirubin level decreased by 50% or more within 2 weeks after the procedure. Patients with failed PBD were referred directly to surgery, while those with successful PBD were referred to surgery 4 to 6 weeks after first drainage procedure according to the latest guidelines