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Chinese Journal of Medical Ultrasound (Electronic Edition) ›› 2021, Vol. 18 ›› Issue (06): 570-577. doi: 10.3877/cma.j.issn.1672-6448.2021.06.006

• Superficial Parts Ultrasound • Previous Articles     Next Articles

Risk factors for cervical lymph node metastasis of papillary thyroid microcarcinoma

Meiwu Zhang1, Shuyi Lyu1, Xiaoxiang Fan1, Luhui Zhuang1, Yuqin Qiu1, Yan Zhang1()   

  1. 1. Department of Interventional Therapy, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo 315010, China
  • Received:2020-06-17 Online:2021-06-01 Published:2021-07-12
  • Contact: Yan Zhang

Abstract:

Objective

To identify the risk factors for cervical lymph node metastasis and multiple metastases of papillary thyroid microcarcinoma (PTMC).

Methods

A total of 499 PTMC patients treated at Ningbo Hwa Mei Hospital of the University of Chinese Academy of Sciences from January 2016 to December 2019 were retrospectively collected. Patient gender, age, and other general information, ultrasound characteristics of the primary PTMC, BRAF mutation detection results, and surgical pathology results were recorded. The number of lymph node metastases >5 was defined as multiple lymph node metastases. Single factor and multivariate logistic analyses were used to identify the risk factors for cervical lymph node metastasis and multiple metastases in patients with PTMC.

Results

The cervical lymph node metastasis rate was 41.9% (209/499), and the multiple lymph node metastasis rate was 7.4% (37/499). Logistic multivariate analysis showed that age <45 years (P=0.010, odds ratio [OR]=1.663), thyroglobulin >7.89 ng/ml (P=0.017, OR=1.597), nodules ≥7 mm (P=0.000, OR=2.120), multiple foci (P=0.001, OR=2.052), and microcalcification (P=0.028, OR=1.987) were independent risk factors for lymph node metastasis. Among the 209 patients with PTMC lymph node metastasis, logistic multivariate analysis showed that nodules ≥7 mm (P=0.010, OR=3.227), male gender (P=0.039, OR=2.398), multiple foci (P=0.006, OR=3.115), and capsule invasion (P=0.032, OR=2.932) were independent risk factors for multiple lymph node metastases.

Conclusion

When patients with PTMC have multiple lesions and the lesion diameter is greater than or equal to 7 mm, they have a higher risk of cervical lymph node metastasis and multiple metastases. Preoperative ultrasound evaluation can provide an aid to the clinical treatment and prognosis evaluation of PTMC patients.

Key words: Papillary thyroid carcinoma, Ultrasonography, Cervical lymph nodes, BRAF V600E gene

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