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Review Question - QID 107110

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QID 107110 (Type "107110" in App Search)
A 66-year old man with a 45-pack-year smoking history presents with abdominal pain and constipation. He reports that he has had a worsening cough for several months and has lost 20 pounds over this time period. You order a complete metabolic profile, which demonstrates hypercalcemia. A chest radiograph shows a centrally located mass suspicious for malignancy. Which of the following is the most likely explanation?