Ultrasound-guided ethanol ablation is an effective treatment modality for patients with cystic thyroid nodules (cystic portion \> 90%); however it is less effective in predominantly cystic thyroid nodules (90% \> cystic portions \> 50%). The volume reduction after EA has been reported 64% - 69.8% for predominantly cystic thyroid nodules. EA is insufficient for 26% (27/103) of patients with predominantly cystic thyroid nodules. Radiofrequency ablation to patients with incompletely resolved clinical problems after EA and the mean volume reduction ratio was 92% at 6-month follow-up. It is well known that RF ablation is effective in both predominantly cystic and solid thyroid nodules. Although RF ablation has effectively treated the patients who were unsatisfactory after EA, to the best of our knowledge, no study to date has compared these two ablation techniques. Therefore investigators performed a prospective randomized study to compare single-session RF ablation and EA for treating predominantly cystic thyroid nodules.
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quantitative volume reduction ratio of a thyroid lesion at six months following compared with before the ablation treatment
Timeframe: at six months following compared with before the ablation treatment