Background: The association of seminoma with malignant hypercalcemia is extremely rare. Case findings: We present a 32-year-old male with hypercalcemia. Subsequently, a metastatic seminoma was discovered according to computed tomography and biopsy testing. Elevated 1,25-dihydroxyvitamin D levels were identified as the cause of hypercalcemia. Conclusion: Hypercalcemia is a rare but possible scenario in seminoma and therefore it is important to consider this uncommon cause in the differential diagnosis.
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