A thyroid nodule is a growth (lump) in the thyroid gland. The thyroid gland is located at the front of the neck, just above where your collarbones meet in the middle. Thyroid nodules are growths of cells in the thyroid gland. These growths can be: Not cancer (benign) or thyroid cancer (malignant) Fluid-filled (cysts) One nodule or a group of small nodules Producing thyroid hormones (hot nodule) or not making thyroid hormones (cold nodule) Thyroid nodules are more common in women than in men. A person's chance of getting a thyroid nodule increases with age. Only a few thyroid nodules are due to thyroid cancer. A thyroid nodule is more likely to be cancer if you: Have a hard nodule Have a nodule that is stuck to nearby structures Have a family history of thyroid cancer Have noticed a change in your voice Are younger than 20 or older than 70 Have a history of radiation exposure to the head or neck Are male
Magnetic resonance imaging (MRI) is a safe, noninvasive test that creates detailed pictures of your organs and tissues. "Noninvasive" means that no surgery is done and no instruments are inserted into your body. MRI uses radio waves, magnets, and a computer to create pictures of your organs and tissues. Unlike other imaging tests, MRI doesn't use ionizing radiation or carry any risk of causing cancer. Cardiac MRI creates both still and moving pictures of your heart and major blood vessels. Doctors use cardiac MRI to get pictures of the beating heart and to look at its structure and function. These pictures can help them decide the best way to treat people who have heart problems. Cardiac MRI is a common test. It's used to diagnose and assess many diseases and conditions, including: Coronary heart disease Damage caused by a heart attack Heart failure Heart valve problems Congenital heart defects (heart defects present at birth) Pericarditis (a condition in which the membrane, or sac, around your heart is inflamed) Cardiac tumors Cardiac MRI can help explain results from other tests, such as x rays and computed tomography scans (also called CT scans). Doctors sometimes use cardiac MRI instead of invasive procedures or tests that involve radiation (such as x rays) or dyes containing iodine (these dyes may be harmful to people who have kidney problems).