ObjectiveTo investigate the safety and efficacy of CT-guided microwave ablation (MWA) in the treatment of osteoid osteoma of lower extremity. MethodsThe clinical data of 7 patients with osteoid osteoma of lower extremity undergoing CT-guided MWA were analyzed retrospectively. Under local anesthesia and guided by CT, bone puncture needle were used to establish working channel, then the ablation needle was precisely inserted into the center of tumor nest with the ablation parameters set as 50 W, lasting for 6 minutes. The visual analogue scale (VAS) was employed to evaluate the clinical efficacy before and after the operation. ResultsFor all 7 patients, the VAS score decreased, and the pain was relieved in different degrees, with no serious complication observed. One patient exhibited as delayed union of the wound, but completely healed after antibiotics employing and local dressing change. ConclusionCT-guided MWA is safe and effective for ostoeid osteoma of lower extremity.

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