Fig. 1

Individual analysis of each benign nodule’s volume (mL) changes over time. Each line represents a separate nodule; time 0 month indicates the day of the RFA procedure, with the length of the line representing the length of the follow-up period. Each circle represents a point in time where the volume of the nodule was measured by ultrasonography, and the points are connected by lines to give an approximate volume reduction rate. After ablation, the 1-month, 3-month, 6-month, and 12-month median volumes were 6.9 (IQR 0.48–10.15; p > 0.0001) mL, 5.72 (IQR 0.77–7.25; p = 0.045) mL; 0.98 (IQR 0.25–3.64; p = 0.007) mL, and 0.11 (IQR 0.07–11.26; p = 0.026) mL, respectively