Thyroid ultrasound

Evaluation of the thyroid gland can be performed by several imaging techniq ues. Although ultrasound (US) lacks specificity for tissue diagnosis and ca n rarely distinguish benign from malignant disease, it can distinguish soli d nodules from simple and complex cysts. It allows accurate estimation of t hyroid size, gives a rough estimate of tissue density (echogenicity), shows vascular flow and velocity (color-flow Doppler), can identify regional lym phadenopathy, and aids in the accurate placing of needles for diagnostic or therapeutic purposes. In addition, it is widely available, relatively rapi d and cheap, visualizes the whole anterior neck, and does not involve ioniz ing irradiation. This article aims at clarifying the role of US in clinical thyroidology by pointing to areas where the technology can aid in clinical decision making. It is argued that more clinician endocrinologists should master and use this technology for diagnostic and therapeutic purposes.