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There is not a simple yes or no answer to this question. Some benign tumors may develop into malignant ("cancerous") tumors, but malignant cells that develop are benign cells that are taken over by cancer. Often the only way to diagnose a "benign" tumor as having become malignant is based on whether the tumor begins to invade other areas. A good example is the follicular adenoma of the thyroid. This is a benign encapsulated tumor (contained within a "shell" of fibrous tissue), made up of some of the thyroid gland cells. If the tumor breaks through the fibrous capsule, it is considered invasive and is then diagnosed as a follicular adenocarcinoma, which is cancer. Certain types of benign tumors are more prone to developing into malignancies (cancers) than others and therefore require close monitoring.

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