Background. Post liver transplant bile duct stenosis is an incident complication and percutaneous transhepatic management is a therapeutic option. The objective of this study was to describe the outcomes of patients treated with serial bile duct bilioplasty due to post transplant bile duct stenosis. Method. A historical cohort of patients who underwent serial bile duct bilioplasty due to post transplant bile duct stenosis treated at the Fundación Cardioinfantil-laCardio between January 2019 and December 2021 were assembled and their outcomes described; success or failure of serial bilioplasty protocol, rate and types of complications that occurred and the need for surgical or endoscopic treatment. Results. Thirty patients who met selection criteria were assembled. The majority (n=27), with live donor liver grafts. The median age was 3.7 years and were predominantly female (n=18). Success rates for serial bilioplasty was found to be above 90% and complication rates oscillated between 22.2 and 65.4%. The main complications found were minor postoperative pain (40%), accidental catheter displacement (36.7%), surgical reintervention (23.3%) and bile duct cholangioscopy (Spyglass) (26.7%). Success rates were higher with live donor liver grafts (p<0.05) and no differences were found in the rate of bile duct cholangioscopy (Spyglass) secondary to the type of graft. Conclusions. The overall success rate of serial bile duct bilioplasty in post liver transplant bile duct stenosis was over 90%. Complication rate decreased as catheter diameters increased. Given the observed success of the procedure, the next goal is to reduce complication rates.