A member asked:

If i had a thyroid scan that read: left lobe of gland is mildly enlarged at 5.8cm x 1.7 x 2.2 . there is a avascular 3 mm hypoechoic nodule in the lower pole of the left lobe. how would i know if it was " hot or cold"?

12 doctors weighed in across 4 answers
Dr. Guido Davidzon answered

Specializes in Nuclear Medicine

You had a thyroid ultrasound which evaluates the anatomy of your thyroid gland. To find out if a thyroid nodule is hot or cold you need a nuclear thyroid scan aka i-123 uptake and scan. This latter is a functional test of your thyroid and characterizes nodules as hot, cold or warm (isointense). However, a 3 mm nodule is likely to small to characterize with a nuclear thyroid scan.

Answered Dec 19, 2014

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Dr. Quang Nguyen answered

Specializes in Endocrinology

The test you stated above is a thyroid ultrasound. It is not a scan. You can't tell if something is hot or cold definitively on a thyroid ultrasound. You need a thyroid scan (using radioactive iodine) to know if something is hot or cold. If your TSH was normal, you probably didn't have a scan for a nodule that small (3 mm).

Answered Jan 19, 2017

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Dr. Gerald Mandell answered

Specializes in Nuclear Medicine

The thyroid scan with i123 radiopharmaceutical is accumulated by the thyroid gland. Scan shows no activity in area of avascular or cold nodule. Ultrasound of thyroid can determine if the nodule is probably cyst or neoplasm. 3mm is quite small. Follow up esamination with us in a few months to see if stable or growing. Might have biopsy of the lesion if suspicious for something other than cyst.

Answered Oct 24, 2017

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Dr. Brad Eilerman answered

Specializes in Endocrinology

What you are describing are ultrasound results. A hypoechoic nodule of 3 mm of size is nearly 100% benign. The only reason to assess if a nodule is overactive (hot) or underactive (cold) is in general hyperthyroidism. If the nodule is hot, then it can be the target of therapy. This is done through a i-131 uptake and scan.

Answered Dec 30, 2016

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