Primary hyperparathyroidism masked by hypothyroidism.
In a woman with myxedema and normal total and ionized plasma calcium levels, persistent hypercalcemia developed when she was treated with thyroxine. A parathyroid adenoma was subsequently removed, with return of plasma calcium levels to normal. Hypothyroidism may therefore be a further cause of "masked" primary hyperparathyroidism. The mechanism of masking is likely to have been mediated by hypomagnesemia.[1]References
- Primary hyperparathyroidism masked by hypothyroidism. Lever, E.G. Am. J. Med. (1983) [Pubmed]
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