Neonatal hypophosphatasia with elevated serum parathyroid hormone

Area of Science:

• Pediatrics
• Endocrinology
• Genetics

Background:

• Neonatal hypophosphatasia is a severe genetic disorder affecting bone mineralization.
• It can lead to metabolic derangements, including hypercalcemia and altered parathyroid hormone (PTH) levels.

Purpose of the Study:

• To describe clinical presentations and autopsy findings in two infants with neonatal hypophosphatasia.
• To investigate the relationship between hypercalcemia, PTH levels, and parathyroid gland morphology in this condition.

Main Methods:

• Case report analysis of two infants diagnosed with neonatal hypophosphatasia.
• Clinical data review including serum calcium, PTH levels, and treatment responses.
• Autopsy findings documenting parathyroid gland structure.

Main Results:

• Case 1: Developed persistent hypercalcemia, elevated PTH, and absent parathyroid glands at autopsy.
• Case 2: No hypercalcemia, but elevated PTH detected early, with one normal parathyroid gland found post-mortem.
• Transient serum calcium reduction observed with phosphate, prednisolone, and calcitonin in Case 1.

Conclusions:

• Neonatal hypophosphatasia can manifest with diverse clinical and biochemical profiles.
• Parathyroid gland abnormalities, including absence or hypoplasia, may contribute to the pathophysiology.
• Further research is needed to understand the full spectrum of endocrine involvement in this disorder.