A thyroid nodule is a lump or growth that develops in the thyroid. In the majority of cases, a thyroid nodule is so small that it will go unnoticed unless discovered by a physician during a routine examination or while having a radiologic study of the Fig 3 neck for other problems. Thyroid nodules are very common; research studies have shown that upto 50% of population have nodules in their thyroid gland.
The difficulty comes from the fact it is impossible to tell the difference between a benign (non-cancerous) nodule and a thyroid cancer which also looks exactly the same on ultrasound, CT, and MRI studies. A fine needle aspirate (FNA) biopsy is the only reliable way to get an answer to this problem.
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Next, read about goiter.