Thyroid cysts are usually diagnosed with a simple procedure called a fine needle aspiration biopsy. It only takes a few minutes. Your doctor will insert a very thin needle through your skin and into the thyroid nodule or lump. The needle draws out a small sample of cells and fluid. More than one sample is often needed. The sample is then examined under a microscope, usually by a specialist known as a pathologist, to check for cancer cells. By ruling out cancer, this test can confirm that your thyroid cyst is benign and not serious.
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