剪切波弹性成像在分化型甲状腺癌随访中评估颈部淋巴结的作用
本研究纳入45例分化型甲状腺癌随访患者的49枚颈部淋巴结，采用B型超声、彩色多普勒和剪切波弹性成像（SWE）评估，以细胞学为主要参考标准。恶性淋巴结硬度显著高于良性（54.58 vs 20.21 kPa，p<0.0001）。SWE诊断恶性细胞的AUC为0.737，敏感度94.7%、特异度50.0%（ cutoff 12.9 kPa），多因素模型中非 habitual 多普勒模式是唯一独立恶性预测因子。SWE可作为多参数评估的补充工具，不应单独用于诊断。
要点
- SWE诊断恶性淋巴结的敏感度高（94.7%）但特异度低（50.0%），不宜单独用于诊断。
- 非 habitual 多普勒模式是多因素模型中唯一独立恶性预测因子（p<0.0001）。
- SWE测值可辅助多参数评估，但 cutoff 12.9 kPa 需外部验证。
关键影像表现/征象
- 恶性淋巴结平均硬度为54.58 ± 34.14 kPa，良性淋巴结为20.21 ± 17.67 kPa（p < 0.0001）。
- FNA-Tg阳性淋巴结平均硬度为48.64 ± 34.39 kPa，阴性淋巴结为21.04 ± 18.05 kPa（p = 0.0015）。
- 全部淋巴结平均硬度为34.24 ± 30.57 kPa。
诊断标准与关键数值
- SWE诊断细胞学恶性淋巴结的AUC为0.737（95% CI: 0.59-0.88）。
- 以样本推导的12.9 kPa为 cutoff 时，敏感度为94.7%（95% CI: 85-100%），特异度为50.0%（95% CI: 32-69%），该 cutoff 需外部验证。
- 多因素模型中，非 habitual 多普勒模式是唯一独立恶性预测因子（p < 0.0001）。
临床应用与阅片要点
- SWE高敏感度可用于筛查，但低特异度意味着阳性结果需结合多普勒和细胞学确认。
- 报告时应记录多普勒模式，非 habitual 模式提示恶性风险增高。
- SWE cut off 12.9 kPa 尚未外部验证，日常阅片不宜直接套用。
局限性
- 样本量较小（45例患者、49枚淋巴结），为单中心横断面研究。
- SWE cutoff 12.9 kPa 为样本推导，需外部验证。
- 细胞学为主要参考标准，部分病例缺乏组织病理学确认。
以上解读依据论文摘要（全文未开放获取或许可不允许翻译转载）。
英文原文（摘要）· 点击展开
OBJECTIVE: To evaluate the role of shear wave elastography (SWE) in the characterization of cervical lymph nodes in patients undergoing follow-up for differentiated thyroid carcinoma.
METHODS: This cross-sectional study included 45 patients and 49 cervical lymph nodes (node-level analysis) evaluated by B-mode ultrasonography, color Doppler, and SWE. Cytology was the primary reference standard, with histopathology when available. SWE stiffness (kPa) and ultrasonographic features were analyzed. Diagnostic performance was assessed using receiver operating characteristic (ROC) analysis, and independent predictors were evaluated using Generalized Estimating Equations.
RESULTS: Mean lymph node stiffness was 34.24 ± 30.57 kPa. Malignant lymph nodes showed higher stiffness than benign ones (54.58 ± 34.14 vs. 20.21 ± 17.67 kPa; p < 0.0001). Nodes with positive FNA-Tg also demonstrated higher stiffness (48.64 ± 34.39 vs. 21.04 ± 18.05 kPa; p = 0.0015). ROC analysis for cytological malignancy yielded an AUC of 0.737 (95% CI: 0.59-0.88), with 94.7% sensitivity (95% CI: 85-100%) and 50.0% specificity (95% CI: 32-69%) at a sample-derived cutoff of 12.9 kPa, requiring external validation. A non-habitual Doppler pattern was the only independent predictor of malignancy in the multivariable model (p < 0.0001).
CONCLUSION: SWE showed moderate discriminatory performance, with high sensitivity but limited specificity. Doppler pattern remained the strongest predictor of malignancy. SWE may be useful as a complementary tool within a multiparametric assessment, but should not be used as a standalone diagnostic method.
引用
- Silveira KAA, Barreto IS, Botelho IMB, et al. Role of shear wave elastography in the evaluation of cervical lymph nodes during follow-up of differentiated thyroid carcinoma. Eur J Radiol. 2026. PMID: 42127650. doi:10.1016/j.ejrad.2026.112923
供执业医师工作参考，不替代临床判断；数值与分级以指南原文为准。