Fig. 2

Images from a 61-year-old woman with multiple parathyroid hyperplasia, one with a slightly ectopic (in the middle portion of the right thyroid gland) localization. US misdiagnosed this lesion as a thyroid nodule (dotted circle) (a). The lesion is well delineated on the MIP image of ¹⁸F-FCH PET (d), axial CT (b), and PET/CT fusion images (e) (arrows). A heterogeneous low-density nodule in the upper mediastinum is well-delineated on the MIP image of ¹⁸F-FCH PET (d) and PET/CT fusion images (f) (hollow arrows), but no abnormal tracer uptake was observed on a ^99mTc-sestaMIBI SPECT/CT image (c) (hollow arrow)