英语语法分析

Gallbladder flap; Extrahepatic bile duct; Defect; Operation.

胆囊瓣；肝外胆管；缺损；手术。

Most often this is due to extrahepatic biliary tract obstruction.

这通常由肝外胆道阻塞所引起。

Patients had a mean number of 5.3 metastases (bilobar in 76%), associated to extrahepatic disease in 27%.

这些患者的平均转移瘤为5.3个（76%有分叶），27%患者合并肝外疾病。