Figure 4.

A 23-year-old female with pain in bilateral hip, knee and elbow joints associated with weakness in walking. Ultrasonography (USG) was normal. Computed tomography (CT) showed a 6.8 × 10.7 × 15.4 cm enhancing lesion in suprasternal space posteriorly, abutting the left infrahyoid strap muscle between the brachiocephalic trunk and left common carotid artery (CCA), suspicious for ectopic parathyroid adenoma in suprasternal space. (a) Early static views show areas of increased tracer uptake in both lobes of the thyroid, with focus of abnormal tracer concentration in the superior mediastinum at the right paracardiac region. (b) Delayed image at 3 h post-injection shows almost complete washout of the tracer from both lobes of the thyroid, with persistent tracer uptake at the right paracardiac region.