Objectives: The choledochal cyst has an incidence of 1 in 100.000-150.000. The purpose of this study was to analyze the variables introduced for the optimization in the diagnosis and treatment of choledochal cyst. Material and Methods: Retrospective study of patients treated in our center by hepatic-jejunostomy and Roux-Y, from September 1988 to November 2012. We analyzed 40 variables including age, symptoms, type of cysts, diagnostic tests, changes in surgical technique, complications and outcomes. Results: Eighteen patients (66.6% female) were grouped according to the age of presentation: Prenatal (< 1 month), Early (124), Delayed (> 24 months). The most common symptoms were jaundice and abdominal pain (for early-onset and late-onset respectively). The 83.3% presented choledochal cysts type I, the ultrasound was sufficient for diagnosis in 94.4%. Since 2004 we modified the surgical technique, performing laparoscopic dissection of the bile duct and cyst, adding a mini-laparotomy (3-5 cm) for hepatic-jejunostomy with 40 cm intestinal loop using polypropylene suture. One complication was observed since 2004, one case of partial dehiscence of the anastomosis resolved with conservative treatment and a cholangitis in 1 patient with hepatic and renal polycystic. In 2012, 83.3% are asymptomatic. Conclusions: The diagnostic have been simplified, in more than 90% of cases was done by ultrasound; advances in minimally invasive surgery and creation of descending loop of 40 cm, have helped to improve the prognosis of choledochal cyst.