A patient with hypertension and chronic renal disease was evaluated for hypercalcemia and hypophosphatemia. Serum parthyroid hormone and urine nephrogenous cyclic adenosine momophosphate levels were both elevated. Absolute and fracional urine excretion of calcium was low, thereby rasising the suspicionof hypoclcuric hyperclcemia. Surgical removal of a parathyroid ademoma led to normalization of the serum calcium, and phosphate values assiociated with the complete absence fo calcium from the 24-hour urine collection returned to normal.
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