PIW: Petroleum Intelligence Weekly (magazine) PIW: Period of Incapacity for Work (human resources management) PIW: Public Interest Watch (Washington, DC)
Cancerous nodules are classified by the types of malignant thyroid cells they contain. These cell types include papillary, follicular, medullary, or poorly differentiated (anaplastic) cells. The prognosis for the patient depends largely on the cell type and how far the cancer has spread by the time it is discovered. In addition to thyroid cancer of the cell types mentioned, thyroid nodules may contain lymphoma, a cancer of the immune system. Cancer from other sites, such as breast and kidney, also can spread (metastasize) to the thyroid gland. The cause of most thyroid nodules is not known. In certain cases, a lack of iodine in the diet can cause the thyroid gland to develop ...
You can have a single nodule or a cluster of nodules. Thyroid nodules are relatively common and rarely cancerous. Your thyroid is a small butterfly-shaped gland located near your larynx (voice box) and in front of the trachea (windpipe).