MSFinals-2675

MSFinals-2675

An 80-year-old woman complains of deep pain in her leg bones that has been gradually worsening over the past 4 months. She has no significant medical history. Upon conducting blood tests, the following results were obtained:
– Calcium: 1.6 mmol/L (normal range: 2.1-2.6)
– Phosphate: 0.5 mmol/L (normal range: 0.8-1.4)
– ALP: 160 u/L (normal range: 30-100)
– Parathyroid hormone (PTH): 100 pg/mL (normal range: 14-65)
What is the most likely diagnosis?