Sarcoidosis-associated hypercalcemia — ABIM Board MCQ
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Correct answer: C — Macrophage-mediated extrarenal 1-alpha hydroxylase activity
Sarcoidosis granulomas contain activated macrophages that convert 25-hydroxyvitamin D to calcitriol, causing increased intestinal calcium absorption and hypercalcemia with suppressed PTH.
Reference: ATS Sarcoidosis Diagnosis Guideline