Table 2.
Diagnostic accuracy of preoperative ultrasound for pathologic T4 papillary thyroid carcinoma.
| References | Country | Study | T4 Patients | Criteria | US accuracy |
|---|---|---|---|---|---|
| King et al. (34) | Hong Kong | SP | 3/14 of PTC | A | 0/3 |
| Choi et al. (35) | South Korea | SR | 1/299 of PTC | B | 0/1 |
| Park et al. (36) | South Korea | SP | 1/94 of PTC | B,C | 0/1 |
| Choi et al. (37) | South Korea | SR | 1/722 of PTC | B | 1/1 |
| Lee et al. (30) | South Korea | SR | 3/568 of PTC | B | 0/3 |
Criteria category: A: poorly defined margin with heterogeneous echogenicity in adjacent fat or muscle or tumor invasion into the lumen; B: focal bulging out or disruption of the thyroid capsule by tumor or more than 25% of perimeter of the tumor was abutting the thyroid capsule; C, tumor diameter. SP, single center prospective; SR, single center retrospective; PTC, papillary thyroid carcinoma; US, ultrasound.