A 57-year-old woman presents to her physician with mild fatigue. Her past medical history is unremarkable. She is taking no medication. No abnormalities are detected on physical examination. The only abnormality detected on routine blood testing is an elevated calcium (2.96 mmol/L [11.9 mg/ dL]) and a serum inorganic phosphorus of 0.65 mmol/L (2 mg/dL). An immunoreactive parathyroid hormone levei is undetectable. The most likely etiology for this patient's high serum calcium is:

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