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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms

stage 0 medullary thyroid carcinoma in situ  listen  (... MED-yoo-LAYR-ee THY-royd KAR-sih-NOH-muh in SY-too)

  No tumor is found in the thyroid but abnormal cells are found by screening tests. These abnormal cells may become cancer and spread into nearby normal tissue.