Thyroid adenoma other imaging findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ammu Susheela, M.D. [2]

Overview

Thyroid scan may be helpful in the diagnosis of thyroid adenoma. Findings on thyroid scan suggestive of thyroid adenoma include hot and functioning nodule.

Other Imaging Findings

Thyroid Scan (radioiodine scintigraphy)

• Nuclear medicine can be used to image the thyroid with radioactive technetium (Tc) or iodine (I) imaging of the thyroid.

Key Findings in Radioiodine Scintigraphy in Thyroid Adenoma

• Cold – 85% of nodules are cold. 5–8% of cold and warm nodules are malignant.
• Functioning nodules – The cells in the nodule take up the iodine much like a normal cell does. The likelihood of cancer is very low in these types of nodules, and a biopsy is usually not necessary.
• Hot – 5% of nodules are hot. Malignancy is virtually nonexistent in hot nodules.
• An ¹²³I scan showing a hot nodule, accompanied by a lower than normal TSH, is strong evidence that the nodule is not cancerous.

Key Examples of Radioiodine Scintigraphy in Thyroid Adenoma

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