Title: The Calcium Conundrum: Hypercalcemia of Unknown EtiologyAuthors: Alp Serhat Kahveci, MD1; Lindsay Moy, DO2; Mohamed Eletrebi, MBBCh3; Brittany Bettendorf, MD, MFA2Department of Internal Medicine, University of Iowa Hospitals and Clinics, Iowa City, IA, United StatesDivision of Rheumatology, University of Iowa Hospitals and Clinics, Iowa City, IA, United StatesDepartment of Pathology, University of Iowa Hospitals and Clinics, Iowa City, IA, United States