Type:
Educational Exhibit
Keywords:
Head and neck, Nuclear medicine conventional, Diagnostic procedure, Education and training
Authors:
L. H. Aung; Moscow/RU
DOI:
10.26044/ecr2019/C-0012
Findings and procedure details
Before thyroid scan patient need to stop antithyroid medications,
amiodarone,
IV contrast agents,
cough medicines,
vitamins.
For lactating patient use Tc-99m pertechnetate but need to pumped out breast milk for 24 hrs.
After IV injection of 74 MBq Tc-99m pertechnetate,
both lobes of thyroid glands are visualized within 5-30 mins.
On thyroid scan thyroid nodules can have following uptakes:
1.
Hyperfunctioning(hot)
2. Isofunctioning(warm)
3. Nonfunctioning(cold)
Cold nodules can be seen as absence of activity and the other hand,
hot nodules demonstrate focally increased activity in constrast to normal thyroid parenchyma.Nodules that are neither hot nor cold but presence of activity in contrast to that of adjacent parenchyma or gland are frequently termed warm nodules.
But,
multinodular goiter can be seen as heterogenous uptake in enlarged thyroid with multiple variable intensity nodules on thyroid scan.
Tc-99m pertechnetate and I-123 are taken up by salivary glands,
thyroid,
gastric mucosa,
choroid plexus.(physiological uptake)
If solitary thyroid nodule is present,
we can do further managements according to Fig 2.