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Articles

Residual, regrowth, and new growth of radiofrequency ablation for benign thyroid nodules of different volumes: two-year follow-up results

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Pages 1172-1178 | Received 16 Mar 2022, Accepted 05 Aug 2022, Published online: 12 Sep 2022

Figures & data

Figure 1. Flow chart of study patient enrollment.

Figure 1. Flow chart of study patient enrollment.

Figure 2. The definitions of parameters for volume assessment after RFA.

(1) Regrowth was defined as a more than 50% increase in total volume (Vt) compared to the previously reported smallest volume on ultrasonography.

(2) Residual vital volume (Vv) increase was defined as a more than 50% Vv increase compared to the previously reported smallest volume. The Vv was the incompletely treated vital nodule volume, noted on the 1- and 3-month follow-up ultrasounds.

(3) New growth was defined as new growth volume (Vn) not found in the early follow-up on ultrasonography. The size of the Vn was not the major consideration.

Figure 2. The definitions of parameters for volume assessment after RFA.(1) Regrowth was defined as a more than 50% increase in total volume (Vt) compared to the previously reported smallest volume on ultrasonography.(2) Residual vital volume (Vv) increase was defined as a more than 50% Vv increase compared to the previously reported smallest volume. The Vv was the incompletely treated vital nodule volume, noted on the 1- and 3-month follow-up ultrasounds.(3) New growth was defined as new growth volume (Vn) not found in the early follow-up on ultrasonography. The size of the Vn was not the major consideration.

Table 1. Demographic characteristics of patients before RFA based on nodule volume.

Figure 3. The changes of nodule volume (A) and VRR (B) at each follow-up point after RFA.

Figure 3. The changes of nodule volume (A) and VRR (B) at each follow-up point after RFA.

Table 2. Treatment outcomes in the subgroups at each follow-up period after RFA.