A 32-year-old female asked:
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will all thyroid tissues show on a radiation iodine scan, even if they aren't cancerous.?

3 doctor answers
Dr. Barry Rosen
34 years experience General Surgery
Preferentially: A radio-iodine scan identifies any tissue that absorbs iodine and will preferentially "light up" any thyroid tissue. Metastatic thyroid cancer (outside the thyroid) will often take-up iodine, although to a lesser extent. Therefore, in order for a scan to effectively identify cancer 'elsewhere', all of the normal thyroid gland must be removed first.
Answered on Sep 20, 2012
Dr. Addagada Rao
56 years experience General Surgery
Yes normal thyroid: Normal thyroid tissue will take iodine as well as isotope iodine into thyroid cell , isotope counter picks the signals and make a MAP of thyroid, the areas with no signals are called cold nodules , 15%- 20% of them will have cancer tissue in them. Over active areas are called hot nodules with much lesser incidence of cancer in them.Certain diseases lot of lymphocytes present so less pick up.
Answered on Jun 26, 2020
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Dr. Quang Nguyen
Specializes in Endocrinology
Yes: Any thyroid tissues that pick up iodine will show up on the scan. Ironically nodules that do not take up iodine have higher risk of cancer.
Answered on Sep 20, 2012

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