Endocrine Surgery – Thyroid Nodules

Thyroid nodules, masses in the thyroid gland, can be the result of benign cell overgrowth (adenomatous hyperplasia) or actual discrete tumors comprised of thyroid cells that can be benign or cancerous. Thyroid nodules can sometimes contain fluid, which usually collects due to bleeding from the fragile blood vessels in thyroid tumors, so called …

https://endocrinesurgery.ucsf.edu/conditions–procedures/thyroid-nodules.aspx