Final answer:
A small percentage of nodules found on the thyroid gland are cancerous, and the use of radioactive iodine (I-131) aids in the diagnosis and treatment of thyroid conditions, including cancer.
Step-by-step explanation:
The thyroid gland, an endocrine organ located in the neck, commonly develops nodules. While the majority of these nodules are benign, a small percentage are cancerous. The exact percentage can vary, but thorough diagnostic evaluation using radioactive iodine and imaging is crucial for detection and treatment. The thyroid's natural absorption of iodine is used to both diagnose and treat conditions, including cancer. Radioactive iodine, such as I-131, is absorbed by the thyroid and can help in destroying excess thyroid tissue or cancer cells within the gland.
Additionally, the presence of nodules may indicate other thyroid dysfunctions that require medical attention, although not all dysfunctions lead to cancer. It's important to note that the uptake of iodine and imaging results are key in determining the nature of these nodules. The use of radiopharmaceuticals in this context is a testament to the specificity of certain elements and compounds to particular tissues in the body.