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Ultrasound - Thyroid

What is an Ultrasound of the Thyroid? Ultrasound is safe and painless, and produces pictures of the inside of the body using sound waves. Ultrasound scanning or sonography, involves the use of a small transducer (probe) and ultrasound gel placed directly on the skin. High-frequency sound waves are transmitted from the probe through the gel into the body. The transducer collects the sounds that bounce back and a computer then uses those sound waves to create an image. Ultrasound examinations do not use ionizing radiation (as used in x-rays), thus there is no radiation exposure to the patient. Because ultrasound images are captured in real-time, they can show the structure and movement of the body_s internal organs, as well as blood flowing through blood vessels.


Ultrasound imaging is a noninvasive medical test that helps physicians diagnose and treat medical conditions.


An ultrasound of the thyroid produces pictures of the thyroid gland and the adjacent structures in the neck. The thyroid gland is located in front of the neck just above the collar bones and is shaped like a butterfly, with one lobe on either side of the neck connected by a narrow band of tissue. It is one of nine endocrine glands located throughout the body that make and send hormones into the bloodstream.


The thyroid gland makes the thyroid hormone, which helps to regulate a variety of body functions including how fast the heart beats. It is very common for patchy areas or nodules to develop in the thyroid that may or may not be felt on the skin surface. About five to 10 percent of adults will have lumps in their thyroid that a doctor can identify on an exam. These are called palpable nodules. Ultrasound is very sensitive and shows many nodules that cannot be felt. In some age groups, nodules are seen on ultrasound in as many as 70 percent of adults. The vast majority of these are benign regions of thyroid tissue that pose no health risk. The minority of these are true tumors of the thyroid and may require further diagnosis or treatment.


What are some common uses of the procedure? An ultrasound of the thyroid is typically used:

to determine if a lump in the neck is arising from the thyroid or an adjacent structure to analyze the appearance of thyroid nodules and determine if they are the more common benign nodule or if the nodule has features that require a biopsy. If biopsy is required, ultrasound-guided fine needle aspiration can help improve accuracy of the biopsy. to look for additional nodules in patients with one or more nodules felt on physical exam to see if a thyroid nodule has substantially grown over time Because ultrasound provides real-time images, images that are renewed continuously, it also can be used to guide procedures such as needle biopsies, in which needles are used to extract sample cells from an abnormal area for laboratory testing. Ultrasound may also be used to guide the insertion of a catheter or other drainage device and helps assure safe and accurate placement and fluid drainage for diagnosis and/or relief of patient discomfort.


How should I prepare? You should wear comfortable, loose-fitting clothing for your ultrasound exam. You may need to remove all clothing and jewelry in the area to be examined.


You may be asked to wear a gown during the procedure.


No other preparation is required.

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