Figure 2. CT-guided radiofrequency ablation of the sympathetic nerve. (A) The line in the image represents the optimal puncture path, designed to reach the thoracic sympathetic ganglion by targeting the gap between the left fourth rib head and the vertebral body before insertion. The distance from the target to the puncture point is 79.31 mm, guiding the selection of a 10-cm puncture needle of appropriate length. (B) The optimal puncture line is designed to target the gap between the third lumbar vertebral body and the abdominal aorta before insertion. The distance of 115.18 mm indicates the designed puncture length, suggesting the use of a 15-cm puncture needle. (C) The yellow box in the image highlights the position of the needle tip at the fourth thoracic vertebral body near the rib. (D) The CT-guided lumbar sympathetic radiofrequency procedure at the left third lumbar vertebra was successfully performed, with the puncture needle reaching the target location.