[A Rare Cause of Hypercalcemia]

A Rare Cause of Hypercalcemia Abstract. Sarcoidosis is a rare cause of hypercalcemia, which is in most cases caused by primary hyperparathyroidism or a malignant tumor. Other rare causes include vitamin D intoxication, other granulomatous diseases (such as tuberculosis, or fungal infection) or mutiple myeloma. Because of the broad differential diagnosis, a systematic diagnostic approach is crucial to establish the correct diagnosis. Therapeutic measures include volume replacement and subsequent administration of bisphosphonates. If hypercalcemia is caused by sarcoidosis, therapy with systemic corticosteroids is indicated.