| Summary: | In patients with thyroid nodules, ultrasonography (US) has been established as a primary diagnostic
imaging method and is essential for treatment decision. The Korean Thyroid Imaging Reporting and
Data System (K-TIRADS) is a pattern-based, US malignancy risk stratification system that can easily diagnose
nodules during real-time ultrasound examinations. The 2021 K-TIRADS clarified the US criteria
for nodule classification and revised the size thresholds for nodule biopsy, thereby reducing unnecessary
biopsies for benign nodules while maintaining the appropriate sensitivity to detect malignant tumors
in patients without feature of high risk thyroid cancer. Thyroid radiology practice has an important
clinical role in the diagnosis and non-surgical treatment of patients with thyroid nodules, and
should be performed according to standard practice guidelines for proper and effective clinical care.
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