Case 1: An Unusual Case of Neonatal HyperthyroidismKnight, Phillip; Ejaz, Sehar · NeoReviews · 2017

Abstract: Objective: To present a case of hypercalcemia associated with thyrotoxicosis in a patient with vitamin D deficiency and review biochemical changes during the course of treatment. Methods: We report a case, describe the changes in serum calcium, phosphorus, parathyroid hormone in Graves' disease and concomitant Vitamin D deficiency. We compare our findings to those reported in literature. Results: Our patient had hypercalcemia secondary to thyrotoxicosis alone, which was confirmed by low parathyroid hormone level and resolution of hypercalcemia with treatment of thyrotoxicosis. The case was complicated by a concomitant vitamin D deficiency. Serum calcium elevation in patients with thyrotoxicosis occurs secondary to hyperthyroidism alone or due to concurrent hyperparathyroidism. Hypercalcemia from thyrotoxicosis is usually asymptomatic and is related to bone resorption. Vitamin D deficiency can be seen in patients with thyrotoxicosis because of accelerated metabolism, poor intestinal absorption and increased demand during bone restoration phase. Coexistence of hypercalcemia and Vitamin D deficiency in patients with thyrotoxicosis is rare, but possible, and 25-hydroxyvitamin D levels should be checked. The definite treatment for hypercalcemia in thyrotoxicosis is correction of thyroid function. Conclusion: Hypercalcemia in thyrotoxicosis should be distinguished from concomitant hyperparathyroidism and confirmed by resolution of hypercalcemia with control of thyrotoxicosis. Patients with hypercalcemia and thyrotoxicosis may also have vitamin D deficiency and 25-OH Vitamin D levels should be An Unusual Case of Hypercalcemia Associated with Graves' Disease and Vitamin D DeficiencyMayrin, ; Evgenia Korytnaya, ; Nagashree Gundu Rao, · Clinical Medicine Insights: Endocrinology and Diabetes · 2011

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