Thyroid ultrasound is the best and most common method for evaluating the thyroid. This imaging test uses sound waves to get pictures of the thyroid gland, surrounding tissue and structures, and the lymph nodes in the neck.
The first imaging study used in work-up and evaluation of thyroid cancer and thyroid problems should always be an expert, skilled, dedicated thyroid and neck ultrasound. Finally, if a needle biopsy (or fine-needle aspiration biopsy) is necessary to diagnose thyroid cancer, an ultrasound is used to guide the needle into the thyroid nodule or lymph node in order to obtain an accurate and safe biopsy.
ULTRASOUND OF THE FETAL THYROID
The fetal thyroid gland can be investigated by transvaginal ultrasonography from about 12 weeks' gestation1 and reliably after 20 weeks' gestation by abdominal ultrasonography employing high-resolution transducers.45 Fetal thyroid volume can be calculated by the previously described ellipsoid equation45 or by measuring fetal thyroid width and circumference,1 the former method probably the more accurate. Recent evidence suggests that the rate of fetal thyroid growth is greatest after 32 weeks'
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