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A rare coexistence of primary hyperparathyroidism and hyperthyroidism due to toxic nodular goiter--a case report.

The frequent association of thyroid and parathyroid disorders has been reported. Most commonly, hyperthyroidism may coexist with hypercalcemia, but the latter is successfully treated when euthyroidism is achieved. However, the concomitant hyperthyroidism with primary hyperparathyroidism is of a rare occurrence. Moreover, it may frequently go unrecognized. In this paper we report a case of a patient with hypercalcemia due to PTH--secreting parathyroid adenoma associated with hyperthyroidism due to toxic nodular goiter. This case demonstrates the dramatic outcome of those two coexisting disorders. We point out that in patients with primary hyperparathyroidism thyroid function test should always be carried out. A proper, first-line treatment of hyperthyroidism will prevent the deterioration of primary hyperparathyroidism course, and thus surgical parathyroid treatment may safely be introduced.