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Hypercalcemic hyperparathyroidism in hypophosphatemic rickets

M Kleerekoper, R Coffey, T Creco

    The Journal of Clinical Endocrinology and Metabolism
    |July 1, 1977
    PubMed
    Summary
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    This study reports a rare case of hyperparathyroidism in a patient with hypophosphatemic rickets. The findings suggest primary hyperparathyroidism is a chance occurrence, not a complication of phosphate therapy.

    Area of Science:

    • Endocrinology
    • Nephrology
    • Skeletal Biology

    Background:

    • Hypophosphatemic rickets is a rare genetic disorder affecting phosphate metabolism and bone health.
    • Hypercalcemia and its complications, such as nephropathy, can occur in various endocrine and metabolic conditions.
    • Primary hyperparathyroidism is characterized by excessive parathyroid hormone production, leading to hypercalcemia.

    Observation:

    • A 25-year-old woman with sporadic hypophosphatemic rickets presented with chronic hypercalcemia, osteitis fibrosa cystica, and nephropathy.
    • Significantly elevated serum parathyroid hormone levels and a large parathyroid tumor were identified.
    • Literature review identified only a few cases associating hypercalcemic hyperparathyroidism with hypophosphatemic rickets.

    Findings:

    Related Experiment Videos

  • The patient's condition was attributed to the co-occurrence of primary hyperparathyroidism and underlying x-linked familial hypophosphatemic rickets.
  • This combination appears to be coincidental rather than a direct complication of phosphate therapy used for rickets.
  • The study highlights the importance of differentiating between primary and secondary causes of hypercalcemia in patients with rickets.

    • Implications:

    • Accurate diagnosis is crucial for effective management of complex endocrine and skeletal disorders.
    • Understanding the etiology of hypercalcemia in hypophosphatemic rickets is essential for appropriate treatment strategies.
    • This case underscores the need for comprehensive evaluation in patients presenting with multiple complex medical conditions.