Lin SY, et al. - Researchers performed this retrospective comparative study evaluating the effectiveness of ultrasound-guided percutaneous ozone injections around the cervical dorsal root ganglions (DRGs) of patients with zoster-associated pain (ZAP). From June 2016 to July 2017, they treated 30 patients with ZAP with ozone injections around the cervical DRG at the injured nerve level (C2-C8). All patients displayed pain reduction; however, a higher success rate was noted for those with disease duration ≤ 3 months vs those with disease duration > 3 months. Findings thus suggested the potential utility of percutaneous ozone injection around the DRG for treatment-resistant cases of ZAP at the cervical level.