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Concept
Thyroid cancer
Summary
Thyroid cancer is cancer that develops from the tissues of the thyroid gland. It is a disease in which cells grow abnormally and have the potential to spread to other parts of the body. Symptoms can include swelling or a lump in the neck. Cancer can also occur in the thyroid after spread from other locations, in which case it is not classified as thyroid cancer.
Risk factors include radiation exposure at a young age, having an enlarged thyroid, family history and obesity. The four main types are papillary thyroid cancer, follicular thyroid cancer, medullary thyroid cancer, and anaplastic thyroid cancer. Diagnosis is often based on ultrasound and fine needle aspiration. Screening people without symptoms and at normal risk for the disease is not recommended as of 2017.
Treatment options may include surgery, radiation therapy including radioactive iodine, chemotherapy, thyroid hormone, targeted therapy, and watchful waiting. Surgery may involve removing part or all of the thyroid. Five-year survival rates are 98% in the United States.
Globally as of 2015, 3.2 million people have thyroid cancer. In 2012, 298,000 new cases occurred. It most commonly is diagnosed between the ages of 35 and 65. Women are affected more often than men. Those of Asian descent are more commonly affected. Rates have increased in the last few decades, which is believed to be due to better detection. In 2015, it resulted in 31,900 deaths.
Most often, the first symptom of thyroid cancer is a nodule in the thyroid region of the neck. However, up to 65% of adults have small nodules in their thyroids, but typically under 10% of these nodules are found to be cancerous. Sometimes, the first sign is an enlarged lymph node. Later symptoms that can be present are pain in the anterior region of the neck and changes in voice due to an involvement of the recurrent laryngeal nerve.
Thyroid cancer is usually found in a euthyroid patient, but symptoms of hyperthyroidism or hypothyroidism may be associated with a large or metastatic, well-differentiated tumor.
Official source
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