A Rare Case of Choledochal Cyst Presented as Sudden and Severe Abdominal Pain.

We report a pediatric case of Type 1C choledochal cyst presented as acute biliary colic pain. Choledochal cyst is an abnormal expansion of the biliary tract. The Type 1 choledochal cyst is the cystic dilation of the common bile duct. The Type Ic choledochal cyst is the fusiform dilatation of the common bile duct with an anomalous pancreaticobiliary junction. Patients with choledochal cysts may have the formation of cholelithiasis due to chronic biliary stagnation and repeated inflammation. Cholelithiasis may fall into the common bile duct to cause biliary colic. Abdominal sonography can be used as a preliminary examination.