Frequently asked question: If a benign thyroid nodule turns out to be a cyst, what does that mean?

A cyst is a cavity filled with fluid. The amount of fluid can fluctuate, which means the cyst can become larger and smaller. The diagnosis is made based on an ultrasound with a needle biopsy. The fluid in the cyst is sucked up through the needle, and then the cells are examined. Sometimes after the biopsy, the cyst disappears completely. If the cyst returns and the cells are benign, you must come for regular check-ups. If the testing of the cells does not result in a clear-cut diagnosis, the cyst is surgically removed and further examined. Thyroid cysts do not occur very often in children.

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