On routine blood work performed for a life insurance application, a 53-year-old woman was found to have a calcium level of 12 mg/dL (normal = 8.8-10.4 mg/dL) and a phosphate level of 2 mg/dL (normal = 3.0-4.5 mg/dL). She is not anemic and has no symptoms. Patient History: Her medical history is significant for osteoporosis, discovered on a dual-energy X-ray absorptiometry (DEXA) scan performed at the time of her menopause 1 year ago.
Which of the following is the most likely cause of her hypercalcemia? *This case is from Docplexus Editorial Team for educative purpose only. Source: Case Files Internal Medicine
