Table 1. Demographics and Characteristics of PTMCs and RFA.
| Characteristics | Data |
|---|---|
| Patients' characteristics (n = 133) | |
| Female:male, number (%) | 114 (85.7):19 (14.3) |
| Mean age ± SD, yrs | 46 ± 12 (range, 19–79) |
| Mean F/U ± SD, M | 39 ± 25 M (range, 6–104) |
| Patients with F/U ≥ 4 yrs, number (%) | 49 (36.8) |
| PTMC characteristics (n = 152) | |
| < 0.5 cm: ≥ 0.5 cm, number (%) | 111 (73):41 (27) |
| F/U ≥ 4 yrs: F/U < 4 yrs, number (%) | 54 (35.5):98 (64.5) |
| Location, number (%) | |
| Right | 67 (44.1) |
| Left | 69 (45.4) |
| Isthmus | 16 (10.5) |
| Mean largest diameter ± SD, cm | 0.43 ± 0.14 (range, 0.3–0.95) |
| Nodule < 0.5 cm | 0.36 ± 0.1 (range, 0.3–0.49) |
| Nodule ≥ 0.5 cm | 0.61 ± 0.12 (range, 0.5–0.95) |
| Mean volume ± SD, mL | 0.03 ± 0.04 (range, 0.001–0.324) |
| Nodule < 0.5 cm | 0.014 ± 0.010 (range, 0.001–0.049) |
| Nodule ≥ 0.5 cm | 0.080 ± 0.006 (range, 0.016–0.324) |
| RFA characteristics | |
| RF session, one:two, number (%) | 137 (92.1):15 (7.9) |
| Total number of RF sessions | 167 |
| Mean RF power, W | 23 ± 5 (range, 15–50) |
| Mean ablation time, s | 136.8 ± 54.2 (range, 30–330) |
| Mean total energy, J | 3169.4 ± 1423.2 (range, 600–11550) |
| Mean delivered energy/tumor volume, J/mL | 274286 ± 445700 (range, 8584–4716379) |
| Active tip size, number (%) | |
| 5 mm | 112 (67.1) |
| 7 mm | 54 (32.3) |
| 10 mm | 1 (0.6) |
F/U = follow-up, J = Joule, M = months, PTMC = papillary thyroid microcarcinoma, RF = radiofrequency, RFA = radiofrequency ablation, s = second, SD = standard deviation, W = Watt, yrs = year