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Background. The choledochal cyst (CC) is a rare cystic dilatory condition with malignant tendency, which is more frequently reported in children. Surgical resection of cysts can significantly decrease the risk of malignancy and reduce associated complications. However, CC has been paid lesser attention in adults, and its surgical parameters have been frequently reported to be in dispute. This study aimed to report experience associated with the treatment of an adult with CC and to suggest the appropriate parameters for the surgery, including the extent of excision (complete or not), the length of the Y limb, the diameter of the cholangio-intestinal anastomosis (CIA), and different operative approaches (open, laparoscopic, and laparoscopic converted to open) by comparing the various indicators, including postoperative bile leakage, cholangitis, choledocholithiasis, carcinogenesis, and surgical re-excision. Methods. We conducted a single-center noninterventional retrospective study of 69 different congenital choledochal cyst patients who were admitted to our hospital between July 2010 and July 2020. We collected and analyzed their demographic data, clinical presentations, underlying complications, imaging tests, endoscopic interventions, and parameters for the surgery, histological data, and prognostic indicators over a mean 77-month follow-up period. Results. We found that out of the 69 cases, the median age at diagnosis was 32 (IQR = 22–45) years. Seven (10.1%) patients were asymptomatic before the diagnosis, with abdominal pain as the primary complaint in 62 (89.9%) patients, whereas nausea/vomiting was observed in 29 (42.0%) patients. CCs were mainly evaluated by using magnetic resonance cholangiopancreatography (MRCP) (n = 47, 68.1%). It was observed that surgery, cholecystectomy, choledochal cysts excision, and Roux-en-Y hepaticojejunostomy (n = 65, 94.2%), and laparotomy (n = 58, 84.1%) were the dominant therapeutic modalities employed. However, seventeen (24.6%) patients were treated with incomplete cyst resection, while 52 (75.4%) patients received complete cyst resection. We also conducted regular follow-ups after the surgery for a mean duration of 77 months. Postoperative complications were found to be experienced by 35 (50.7%) patients, and a further two patients (2.9%) developed malignancy during the follow-up. Moreover, increasing the diameter of cholangio-intestinal anastomosis served as a potential protective factor for postoperative choledocholithiasis ( p  = 0.040) and a risk factor for cholangitis ( p  = 0.002). Conclusions. Among the 69 CC participants, abdominal pain was their major symptom. Those with an abnormal pancreaticobiliary junction were more likely to have choledocholithiasis and pancreatitis. The diagnosis was found to be highly dependent on the Todani classification scheme and MRCP. Surgical resection remains the key to CC treatment. The results suggested that the complete resection, the length of the Y limb of 40 cm–60 cm, and the diameter of the CIA of 1.0 cm–1.5 cm were appropriate values for predicting the lower risk of postoperative complications.

Surgical Management and Prognosis of Congenital Choledochal Cysts in Adults: A Single Asian Center Cohort of 69 Cases