Purposes: Dilatation of cystic duct is very rare and had been classified as Todani type VI choledochal cyst. Choledochal cyst combined with dilatation of cystic duct is difficult to diagnose preoperatively. The purpose of this study is to report the rare variants and discuss the significance and laparoscopic management strategy in children. Methods: The subjects for this study were 10 consecutive patients with type VI choledochal cyst who had laparoscopic procedures at our institute between January 2009 and January 2023. Laparoscopic cholecystectomy, excision of the dilated cystic duct, and choledochal cyst were carried out, and the continuity of the biliary duct was re-established through a Roux-en-Y hepaticojejunostomy. Results: Cystic duct combined with the common bile duct dilatation was revealed in all the patients intraoperatively. Laparoscopic procedures were completed with no conversions. The postoperative recovery was uneventful. The mean follow-up duration was 27 ± 12.7 months (range 5-36 months) with no postoperative complications encountered. Conclusions: The rare entity of type VI choledochal cyst should be recognized as a distinct type of choledochal cyst and need to be given enough attention clinically. The laparoscopic procedure is a feasible option for experienced surgeons.
Keywords: children; choledochal cyst; diagnosis; laparoscopic; type VI.