Fig. 1

Preoperative dynamic computed tomography study. a Low-density area (arrow head) located adjacent to the scar of radiofrequency ablation (arrow) in the plain phase. b The image of early phase does not show early staining on the area. c The image of late phase visualized a well-defined mass with enhancement on the area. d The image of multiplanar reconstruction of the tumor (arrow head) with the bile duct thrombus (asterisk). BDTT continued from the tumor into the right hepatic duct