Thyroid Ultrasound Examination: Results of the Fourth Full-scale Survey (Fifth-round Survey)

These are the results of the fourth Full-scale Survey, which was the fifth round of the Thyroid Ultrasound Examination.

The survey was conducted over three years due to the influence of COVID-19 pandemic.

Participants diagnosed as Grade A in the Primary Examination accounted for 98.8% of the total. Those diagnosed as Grade B accounted for 1.2%. Most of those diagnosed as Grade A2 had cysts of 20 mm or smaller, and most of those diagnosed as Grade B had nodules of 5.1 mm or larger. This tendency was the same as that observed in the Preliminary Baseline Survey and the Full-scale Surveys (the second, third, and fourth-round surveys).

In the Confirmatory Examination, as a result of fine-needle aspiration cytology, 39 participants were diagnosed that their tumors were malignant or suspicious for malignancy.

• Included in this reference material on March 31, 2024