Abstract：
Duplication of the common bile duct (CBD) is extremely rare among the anatomical variations in the biliary tract system, which presents a septum within the CBD or an accessory CBD. In our study, we report a rare case of duplication of the common bile duct combined congenital biliary dilatation.we present a rare case of a septum in the dilated biliary tract.
We reported a 5-year-old Asian girl who had history of repeated abdominal pain for 4 days and aggravated for 1 day. Magnetic resonance cholangiopancreatography (MRCP) examination revealed duplicated common bile duct (DCBD) malformation with congenital biliary dilatation and distal cholelithiasis. The patient underwent choledochal cyst resection and biliary tract reconstruction and abdominal cavity irrigation and drainage under general anesthesia. A septum was found within the common bile duct during the operation. The septum divided the extrahepatic bile duct into two parts connected to the left and right hepatic ducts respectively and the gallbladder is attached to the repeated right bile duct which was not previously reported in the literature.
We complement and adjust the classification of common bile duct duplication by reviewing the literature.
We reported a 5-year-old Asian girl who had history of repeated abdominal pain for 4 days and aggravated for 1 day. Magnetic resonance cholangiopancreatography (MRCP) examination revealed duplicated common bile duct (DCBD) malformation with congenital biliary dilatation and distal cholelithiasis. The patient underwent choledochal cyst resection and biliary tract reconstruction and abdominal cavity irrigation and drainage under general anesthesia. A septum was found within the common bile duct during the operation. The septum divided the extrahepatic bile duct into two parts connected to the left and right hepatic ducts respectively and the gallbladder is attached to the repeated right bile duct which was not previously reported in the literature.
We complement and adjust the classification of common bile duct duplication by reviewing the literature.
摘要：
在胆道系统的解剖变异中，胆总管（CBD）的重复非常罕见，它在CBD或附属CBD内呈现隔膜。在我们的研究中,我们报道了一例罕见的胆总管重复合并先天性胆管扩张的病例。我们提出了一个罕见的情况下，在扩张的胆道隔膜。
我们报道了一名5岁的亚洲女孩，她有4天的反复腹痛史，并加重了1天。磁共振胰胆管造影（MRCP）检查显示胆总管（DCBD）畸形伴先天性胆管扩张和远端胆石症。患者在全麻下行胆总管囊肿切除术和胆道重建及腹腔冲洗引流术。手术期间在胆总管内发现了隔膜。隔膜将肝外胆管分为两部分，分别连接到左肝管和右肝管，胆囊连接到重复的右胆管，这在文献中没有报道过。
我们通过查阅文献对胆总管重复的分类进行补充和调整。
我们报道了一名5岁的亚洲女孩，她有4天的反复腹痛史，并加重了1天。磁共振胰胆管造影（MRCP）检查显示胆总管（DCBD）畸形伴先天性胆管扩张和远端胆石症。患者在全麻下行胆总管囊肿切除术和胆道重建及腹腔冲洗引流术。手术期间在胆总管内发现了隔膜。隔膜将肝外胆管分为两部分，分别连接到左肝管和右肝管，胆囊连接到重复的右胆管，这在文献中没有报道过。
我们通过查阅文献对胆总管重复的分类进行补充和调整。
