Parathyroid-independent hypercalcemia as initial presentation of renal sarcoidosis with granulomatous interstitial nephritis: a case report

This case underscores the diagnostic difficulty of renal sarcoidosis, particularly in hypercalcemic patients without renal biopsy. Early use of corticosteroids can improve renal function, but complications like nephrolithiasis may still occur, so continuous monitoring is still necessary. A high index of suspicion and timely biopsy are essential for diagnosis and optimal management.