Fig. 3

Individual analysis of each malignant 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, and 6-month mean volumes were 0.19 (IQR 0.12–0.31; p = 0.190) mL, 0.10 (IQR 0.05–0.15; p = 0.130), and 0.01 (IQR 0.005–0.04; p = 0.360), respectively