Microwave ablation with a blunt-tip antenna for pulmonary ground-glass nodules: a retrospective, multicenter, case–control study

PURPOSE: A previous small-sample study verified that a blunt-tip antenna reduced hemorrhage during microwave ablation. We conducted this large-sample, multicenter, case–control study to further verify the efficacy and safety of microwave ablation with a blunt-tip antenna for ground-glass nodules. MATERIALS AND METHODS: Patients with pulmonary ground-glass nodules were treated with either a sharp-tip (Group A) or blunt-tip antenna (Group B). A total of 147 and 150 patients were retrospectively allocated to Groups A and Group B, respectively. Group A patients underwent 151 procedures, and Group B patients underwent 153 procedures. We assessed the technical success, technique efficacy, and complications. RESULTS: Technical success and overall technique efficacy were achieved in all patients (100%). Major complications of pneumothorax were more commonly observed in Group A than in Group B (19.7% vs. 2.0%, p < 0.001). Minor complications, such as intrapulmonary hemorrhage (2.0% vs. 9.5%, p = 0.005) and hemothorax (0.0% vs. 2.7%, p = 0.049), occurred less frequently in Group B compared to Group A. CONCLUSION: In the treatment of ground-glass nodules, microwave ablation with a blunt-tip antenna had equal efficacy compared to microwave ablation with a sharp-tip antenna but had a decreased number of hemorrhage and hemothorax complications.