FIGURE 3.

Illustration of dorsal approach. Figure A and B showed the posture for patients on the CT scan bed and the planned dorsal approach to the lesion. The puncture route was carefully designed on the preoperative contra-enhanced CT image (white arrow in liver in C and E). The appropriate angle and the depth of RFA probe (152.3 mm in C, 190.19 mm in E) were selected to avoid puncture injury to the vessels. The puncture site (b) was marked on skin (55.09 mm) with the help of an imaging marker (a). The probe was accurately positioned following the planned route (D and F). CT = computerized tomography, RFA = radiofrequency ablation.