Differential diagnosis between hepatic alveolar echinococcosis and intrahepatic cholangiocarcinoma with conventional ultrasound and contrast-enhanced ultrasound oleh Zeng-Cheng Wa, Ting Du, Xian-Feng Li, Hui-Qing Xu, Qiu-Cuo Suo-Ang, Li-Da Chen, Hang-Tong Hu, Wei Wang, Ming-De Lu