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Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints,blood vessels and internal organs. Its aim is often to find a source of a disease or to exclude any pathology.
Thyroid nodules are common and are often detected incidentally when a patient has a neck ultrasound. A nodule may range in size from several mm to several cm, and may be detected visibly, by examination of the neck clinically, or by ultrasound assessment.