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A 55-year-old man with a 24-year history of pseudohypoparathyroidism type 2 presented with a mass in the right buttock and reported difficulty walking. At the time of diagnosis, he had had a low serum calcium level (5.2 mg per deciliter [1.3 mmol per liter]) and a high phosphate level (9.1 mg per deciliter [2.9 mmol per liter]) without an increase in urinary phosphate excretion despite normal urinary excretion of cyclic adenosine monophosphate in response to parathyroid hormone. At that time, he was treated with vitamin D, aluminum gel, and calcium carbonate. Subsequently, serum calcium and phosphate levels were well controlled, . . . [Full Text of this Article] |