Fig. 6.

Ectopic midline retrosternal parathyroid adenoma in 35 Y/O female, known case of thyroid ca and thyroidectomy. Presented with hypercalcemia and hyperparathyroidism. (a) Early image (after 20 min of injection) and late image (after 2 h) shows midline focal area of enhanced radiotracer uptake and retention respectively noted at the level of thoracic inlet posterior to the manubrium sterni. (b) SPECT/CT imaging localizes upper retrosternal soft tissue density lesion located anterior to the left innominate vein and superior border of the aortic arch.