Novel Intraoperative CT-Guided Marking Using O-arm System in Video-Assisted Thoracoscopic Surgery: An Easy, Safe, Time-Saving, Practical Method.

With the increased frequency of small lung tumor detection, there has been a similar increase in limited surgery, such as wedge resection. To identify such small lung tumors, we use a computed tomography (CT)-guided intraoperative marking method using the O-arm Surgical Imaging System. We retrospectively investigated its usefulness. Of 1,043 cases of thoracic surgery performed at our department between May 2017 and June 2021, O-arm System marking was used in 30 cases (2.9%), totaling 39 lesions. Tumor location was predicted preoperatively based on 3-dimensional CT and anatomic positioning. Visceral pleura near the tumor was marked with a metal clip, and the O-arm System was brought to the surgical site. CT was taken after the tumor side lung was fully re-expanded and clamped. After confirming the tumor and the clip locations, the clip was repositioned as necessary and marked in the same way. If the marking was successful, the clips were used as markers when performing lung resection. Marking was successful in all cases. The average number of targets was 1.3, the average number of O-arm insertions was 1.3, and the average total number of marking clips was 2.6. In all cases, we checked the specimens, and if the tumor was palpable, the resection margin was also checked. No intraoperative or postoperative complications were observed in any patients. If the O-arm System is available, this technique is a noninvasive, simple, and useful method that could be widely used in clinical practice with a low dose of radiation.