Update on ultrasound diagnosis for thyroid cancer

Thyroid nodules are prevalent in the general population. Distinguishing benign and malignant thyroid nodules is a clinical challenge. Although ultrasonography is commonly used for the assessment of thyroid nodules, previous studies have found that its usefulness is controversial. Therefore, there is a need to assess the clinical value of ultrasonography reported in the literature. This article reviews the literature on the clinical value of greyscale ultrasonography, colour and power Doppler ultrasonography, and ultrasound elastography in differentiating benign and malignant thyroid nodules.