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  • Title: [Familial hypercalcemia and hypophosphatemia: importance in differential diagnosis of disorders in calcium-phosphate metabolism].
    Author: Zofková I.
    Journal: Vnitr Lek; 2010 May; 56(5):397-401. PubMed ID: 20578589.
    Abstract:
    Hypercalcemia and hypophosphatemia are symptoms of two relatively rare hereditary diseases and are extraordinarily important from the standpoint of the differential diagnosis. Mutation in calcium sensing receptor gene (CaSR) clinically manifests as familial hypocalciuric hypercalcemia (FHH) or as the much more serious neonatal hyperparathyreosis. Hypercalciuric hypocalcemia is extremely rare. Prognosis for the most frequent mutations in the CaSR gene FHH is considered benign; nevertheless, if overlooked it can lead to an incorrect diagnosis of primary hyperparathyreosis, which has a fundamentally different prognosis and treatment. Familial hypophosphatemia sometimes occurs as hereditary rickets, which is a consequence of insufficient production of vitamin D-hormone or abnormal function of vitamin D receptors (VDR). The disease manifests as X-linked dominant hypophosphatemic rickets or autosomal dominant hypophosphatemic rickets. Autosomal recessive form is very rare. Oncogenic hypophosphatemia should be excluded in differential diagnosis. In this review the issues of pathogenesis, differential diagnosis and treatment of FHH and hypophosphatemic rickets are discussed.
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