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Diagnostic utility of fine needle aspiration cytology in pediatric thyroid nodules based on Bethesda Classification

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Published/Copyright: February 24, 2021

Abstract

Objectives

The Bethesda system for reporting cytopathology (TBSRTC) has been widely adopted in the management of thyroid nodules. Based on the limited pediatric data available, the implied malignancy risk for each of the categories may be significantly different in pediatrics vs. adults, especially in the indeterminate categories (Bethesda Class III or IV). We report the diagnostic utility of fine needle aspiration (FNA) biopsy at our institution based on the Bethesda system and the risk of malignancy in each category.

Methods

We retrospectively reviewed all patients who underwent a thyroid FNA at our tertiary pediatric hospital from 12/1/2002 to 11/30/2018. FNA results were classified according to TBSRTC. Patient demographics, cytology, histopathology, radiological and clinical follow-ups were examined.

Results

A total of 171 patients were included with 203 cytological samples. Average age at initial FNA was 14.7 years (range 6.9–18.6 years). The numbers of nodules reported for Bethesda categories I–VI were 29, 106, 22, 14, 6 and 26, respectively, and the rate of malignancy was: 13.8, 4.7, 22.7, 35.7, 83.3 and 100%, respectively. Use of ultrasound guidance reduced the non-diagnostic rate from 38.1 to 11.5%. Introduction of on-site adequacy testing further reduced the non-diagnostic rate to 6.5% since 2014.

Conclusions

The risk of malignancy for thyroid nodules in this pediatric cohort is higher than reported in adults. However, rates described here are much closer to adult ranges than previously published pediatric cohorts. The addition of adequacy testing improved the non-diagnostic rate of FNA procedures performed with ultrasound guidance.


Corresponding author: Wen Jiang, MD, Division of Otolaryngology, Department of Surgery, Rady Children’s Hospital, 3020 Children’s Way MC 5024, San Diego, CA92123, USA, Phone: +1858 576 1700 ext 223795, Fax: +1 858 966 8038, E-mail:

  1. Research funding: None declared.

  2. Author contributions: Dr. Wen Jiang designed the study and data collection method, collected data with chart reviews, drafted the initial manuscript, reviewed and revised the manuscript, approved the final submission. Dr. Susan Phillips participated in study design, data analysis, reviewed and revised the manuscript. Dr. Robert Newbury provided initial patient identification for the chart reviews, contributed to the cytologic method section of the initial manuscript, reviewed and revised the manuscript. Dr. John Naheedy contributed to the radiologic and procedural section of the initial manuscript, reviewed and revised the manuscript. Dr. Ron Newfield participated in study design, reviewed and revised the manuscript, and approved the final submission. All authors listed assume responsibility and accountability for the results published here.

  3. Competing interests: Authors state no conflict of interest.

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Received: 2020-11-08
Accepted: 2020-12-16
Published Online: 2021-02-24
Published in Print: 2021-04-27

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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