The Uncharted Link Between Desogestrel and Hypercalcemia

Area of Science:

• Endocrinology
• Pharmacology

Background:

• Hypercalcemia presents a diagnostic challenge, particularly when the etiology is unclear.
• A 37-year-old female with a history of gonadotropin-secreting pituitary microadenoma and recurrent kidney stones developed hypercalcemia.

Observation:

• The patient exhibited hypercalcemia, hypercalciuria, elevated 1,25-dihydroxyvitamin D, and suppressed parathyroid hormone levels.
• Standard investigations for granulomatous diseases like sarcoidosis and other common causes of hypercalcemia were negative.
• Imaging and diagnostic tests yielded normal results, complicating the etiological diagnosis.

Findings:

• A notable improvement in the patient's hypercalcemia was observed after discontinuing oral contraceptives containing desogestrel.
• This suggests a potential, previously unrecognized association between desogestrel use and the development of hypercalcemia.

Implications:

• Clinicians should maintain a high index of suspicion for medication-induced hypercalcemia, even in the absence of typical risk factors.
• This case highlights the importance of a thorough medication review in managing complex hypercalcemia cases.
• Further research may be warranted to elucidate the mechanism by which desogestrel could induce hypercalcemia.