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. 2019 Jul 22;18(3):2995–3002. doi: 10.3892/ol.2019.10641

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Copyright: © Liu et al.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Figure 1. — Ultrasound-guided fine-needle aspiration biopsy of thyroid nodules. (Aa and b) The thyroid nodule was examined with ultrasound, using (Aa) 2-dimensional grayscale ultrasound and (Ab) a color Doppler ultrasound. The red color in the center of the color Doppler ultrasound image indicates the blood flow signal of the nodule is toward the ultrasound probe, whereas the blue color indicates the opposite direction. The red and blue area on the right side of Ab indicates the blood flow range, which is the range of blood flow velocities that can be measured. (B) The puncture route is at 30–40° to the long axis of the probe surface. (C) A fine needle was inserted into the thyroid nodule.