Calcium homeostasis is maintained by multiple hormones and organ systems. There are myriad differentials for hypercalcemia, but the most common cause is primary hyperparathyroidism. Of the remainder, most non-PTH mediated cases are due to malignancy or granulomatous disease. The following case presents a man with an unusual cause of hypercalcemia.
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Sternlieb et al. (2024) studied this question.
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