Clinical utility of sonographic features in indeterminate pediatric thyroid nodules

in European Journal of Endocrinology
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  • 1 Department of Radiology, Brigham and Women’s Hospital
  • 2 Thyroid Center, Brigham and Women’s Hospital
  • 3 Division of Endocrinology, Boston Children’s Hospital, Boston, Massachusetts, USA
  • 4 Department of Surgery, Boston Children’s Hospital, Boston, Massachusetts, USA

Correspondence should be addressed to A J Wassner; Email: Ari.Wassner@childrens.harvard.edu

Objective

Surgical resection is recommended for cytologically indeterminate pediatric thyroid nodules due to their intermediate malignancy risk. We evaluated the utility of ultrasound characteristics for refining malignancy risk to inform the management of these nodules.

Design

Retrospective cohort study (2004–2019).

Methods

We analyzed consecutive thyroid nodules with indeterminate fine-needle aspiration cytology (Bethesda category III, IV, or V) in pediatric patients (<19 years). We assessed the association of demographic and sonographic characteristics with malignancy risk among all indeterminate nodules and within each Bethesda category.

Results

Eighty-seven cytologically indeterminate nodules were identified in 78 patients. Bethesda category was III in 56 nodules (64%), IV in 12 (14%), and V in 19 (22%). The malignancy rate was 46/87 (53%) overall, and 23/56 (41%), 8/12 (75%), and 15/19 (79%) in Bethesda III, IV, and V nodules, respectively. Malignancy rate was higher in solitary nodules (67% vs 37%, P = 0.004) and nodules with irregular margins (100% vs 44%, P < 0.001) or calcifications (82% vs 43%, P = 0.002). American College of Radiology Thyroid Imaging, Reporting and Data System (ACR TI-RADS) risk level TR5 was associated with a higher rate of malignancy than lower TI-RADS risk levels (80% vs 42%, P = 0.002). Within individual Bethesda categories, TI-RADS risk level was not associated with malignancy. No sonographic feature had a negative predictive value for malignancy greater than 80%.

Conclusions

In pediatric thyroid nodules with indeterminate cytology, some sonographic features – including higher ACR TI-RADS risk level – are associated with malignancy, but these associations are unlikely to alter clinical management in most cases.

 

     European Society of Endocrinology

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