This report presents a unique case of hypercalcemia with an elusive etiology. A 37-year-old Caucasian female with a history of gonadotropin-secreting pituitary microadenoma and recurrent nephrolithiasis was found to have hypercalcemia, hypercalciuria, elevated 1,25-dihydroxyvitamin D levels, and low parathyroid hormone levels. Extensive investigations were conducted to identify the cause, including ruling out sarcoidosis and other granulomatous disorders. Imaging and diagnostic testing revealed normal results. The patient's condition considerably improved after the cessation of an oral contraceptive pill containing desogestrel. This surprising association raises the possibility that the use of desogestrel could result in hypercalcemia as one of the side effects. To ensure proper care and avoid consequences linked to severe hypercalcemia, a high index of suspicion is needed to detect the underlying cause of hypercalcemia, even in the absence of usual indications.
Keywords: calcium levels; calcium metabolism; desogestrel; hypercalcemia; oral contraceptives; parathyroid hormone; vitamin d.
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