It was reported that insufficient roll-off occurred and the procedure was cancelled.The target lesion was located in the osteoid osteoma in the right leg tibia bone.The soloist needle was advanced through a 13 gauge 10cm biopsy needle.After positioning the soloist needle, the biopsy needle was pulled back 1.5 cm and ablation was started in the lesion.Lesion size was 7 mm.After the first ablation cycle of 15 min, no impedance was achieved.The impedance remained constant at 260 to 270.The 2nd cycle was started from 70% of the highest set power of 1st cycle, and continued for 5 min at the same power then start increasing power as 1watt/min, but impedance was not achieved.Impedance remained constant at 260 to 270.The same process was repeated 5 times and impedance was not achieved.The procedure was not completed due to this event.There were no patient complications and the patients status was stable.
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