Parathyroid Scintigraphy - European Association of Nuclear Medicine

Figure 2
This patient with a previous history of thyroid surgery (right lobectomy) was referred with a recent
diagnosis of primary hyperparathyroidism. Ultrasound examination suggested the presence of
a parathyroid adenoma at the side of previous thyroid lobectomy, which was a false-positive
image. The large field of view 99m Tc-sestamibi acquisition shows a mediastinal focus (arrow).
The suspected ectopic parathyroid was confirmed by MRI (arrow). A mediastinal parathyroid
adenoma of 0.59 g was resected.
Figure 3
Parathyroid 99m Tc-sestamibi/ 123 I subtraction scintigraphy in a patient with primary hyperparathyroidism.
The computed subtraction images show two sites of preferential 99m Tc-sestamibi
uptake: one at the lower third of the left thyroid lobe and the second lateral to the lower pole
of the right thyroid lobe. Two adenomas were excised: a left parathyroid adenoma weighing
2.3 g and a right adenoma weighing 0.07 g.
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