Table 2.
Nodule volume changes according to the follow-up period
| Variable | Index | 1 year | 2 years | 3 years | 4 years | 5 years | Final |
|---|---|---|---|---|---|---|---|
| No. of nodules | 90 | 64 | 55 | 47 | 40 | 38 | 90 |
| Vt | 14.3 | 3.8 | 2.9 | 2.4 | 2.7 | 3.6 | 2.6 |
| Va | - | 1.5 | 1.2 | 1.3 | 0.7 | 0.6 | 0.6 |
| Vv | - | 2.3 | 1.8 | 1.1 | 2.0 | 3.0 | 2.6 |
| VRR (%) | - | 76.6 | 84.1 | 85.4 | 87.4 | 74.5 | 81.2 |
| No. of cases with Vv increase (%) | - | 11 (17.2) | 8 (14.5) | 5 (10.6) | 4 (10.0) | 8 (21.1) | 40 (44.4)a) |
| No. of cases with regrowth (%) | - | 1 (1.6) | 4 (7.3) | 4 (8.5) | 2 (5.0) | 8 (21.1) | 25 (27.8)b) |
| No. of RFA sessions | - | 1.1 | 1.2 | 1.2 | 1.3 | 1.4 | 1.5c) |
Vt, total volume; Va, ablated volume; Vv, viable volume; VRR, volume reduction rate; RFA, radiofrequency ablation.
a)
The cumulative number of nodules that showed more than a 50% increase in viable volume.
b)
The cumulative number of nodules that showed more than a 50% increase in total volume.
c)
The cumulative number of RFA sessions during follow-up.