2.3. US Examination

In the study, thyroid ultrasonography was performed with an ultrasonography device “Canon Aplio i800” with a linear probe i18LX5 (5–18 MHz), and with “Philips EPIQ 5G” with a linear probe eL 18-4. The ultrasound examination was performed by one of five certified radiologists with five and more years of experience. All ultrasound and biopsies, as well as documentation, were carried out by one radiologist. After ultrasound, the description documented the localization of the thyroid nodules, its size, contour, borders, shape, internal components, echogenicity, calcifications, vascularization, as well as the appearance of the thyroid parenchyma and lymph nodes of the neck.