Effectiveness of percutaneous ethanol injection therapy in benign nodular and cystic thyroid diseases: 12-month follow-up experience

This study was designed to clarify the long-term efficacy of percutaneous ethanol injection (PEI) therapy in benign nodular and cystic thyroid diseases. Solid nodule and complex cyst were classified into three groups in accordance with volume reduction. In solid nodule (n = 38) and complex cyst (n=8), initial volume was significantly reduced to final volumes, and volume reduction persisted during follow-up period. Complete response, partial response and no response were as follows: 21 %, 63 %, 15 % in solid nodule; 37,5 %, 50 %, 12,5 % in complex cyst, respectively. Differences of volume reduction according to initial volume (>10 mL vs