Fig. 2A & B.

37-year-old male with MEN 1. The patient was injected with 25.8 mCi Tc-99m sestamib, i and images of the neck and chest in the anterior view were acquired at 10 minutes and at 2 hours. Early images (2A) show tracer uptake in both lobes of the thyroid gland, more prominent in the left mid thyroid and lower pole of right thyroid. Delayed images (2B) demonstrate a large persistent focus of increased radiotracer uptake in the mid left thyroid lobe and a smaller persistent focus of increased radiotracer uptake in the lower pole of the right thyroid lobe. Two questionable foci of less intense persistent tracer uptake also appear in the upper pole of the right thyroid lobe and the lower pole of the left thyroid lobe. Findings are consistent with multiple parathyroid adenomas or parathyroid hyperplasia.