RecruitingDrug trial99mTc Sestamibi SPECT/CT vs 18F Fluorocholine PET/CTThis study proposes the use of a well-established PET isotope, Fluorine-18 (18F), bound to Choline, for a prospective single-center, single-arm study for participants with suspected parathyroid adenoma and negative or equivocal standard of care 99mTc Sestamibi SPECT/CT