The use of small caliber arteries is probably responsible for the higher hepatic artery thrombosis rate initially reported after living related liver transplantation. We described a two-step strategy generating flow-induced enlargement of a small diameter artery in case of left graft dual arterial supply. The smaller arterial branch was ligated during a laparoscopic first-step procedure inducing a 30% enlargement of the remaining branch. The second-step donor hepatectomy was performed 1 week later using a larger artery for successful vascular anastomosis. The flow-induced enlargement of donor hepatic artery may help to reduce hepatic artery thrombosis risk after pediatric living related liver transplantation.