A Practical CEUS Thyroid Reporting System for Thyroid Nodules

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• The diagnostic role of contrast-enhanced ultrasound (CEUS) in thyroid nodule evaluation remains underexplored.
• Reducing unnecessary fine-needle aspiration (FNA) biopsies is crucial for patient care and healthcare efficiency.

Purpose of the Study:

• To develop and validate a novel Thyroid Imaging Reporting and Data System (TI-RADS) incorporating both nonenhanced ultrasound and CEUS features.
• To enhance the stratification of malignancy risk in thyroid nodules using this integrated imaging approach.

Main Methods:

• A retrospective analysis of 801 thyroid nodules from 756 patients who underwent nonenhanced US, CEUS, and FNA biopsy.
• Logistic regression analysis identified independent predictive features from qualitative US and CEUS findings to construct the CEUS TI-RADS.
• Internal cross-validation and two independent external validation sets were used to assess the system's performance.

Main Results:

• The developed CEUS TI-RADS demonstrated a superior area under the receiver operating characteristic curve (0.93) compared to existing systems.
• It achieved a high biopsy yield for malignancy (66%) while significantly reducing the unnecessary biopsy rate (34%).
• External validation confirmed robust performance with areas under the curve of 0.89 and 0.90, and malignancy yields of 61% and 57% respectively.

Conclusions:

• A new CEUS-based TI-RADS effectively stratifies thyroid nodule malignancy risk by integrating nonenhanced US and CEUS qualitative features.
• This system shows promise in improving diagnostic accuracy and reducing the need for invasive procedures like FNA biopsies.
• The CEUS TI-RADS represents a valuable advancement in the noninvasive evaluation of thyroid nodules.