Infant With Pseudohypoparathyroidism Type 1a, Misdiagnosed as Congenital Hypothyroidism

Area of Science:

• Pediatric Endocrinology
• Genetics and Genetic Diseases
• Hormone Resistance Syndromes

Background:

• Hypothyroidism is a key feature of pseudohypoparathyroidism type Ia (PHP Ia), stemming from multi-hormonal resistance.
• Congenital hypothyroidism can be a presenting sign, potentially leading to misdiagnosis.
• PHP Ia is characterized by Albright's hereditary osteodystrophy (AHO) and hormone resistance.

Approach:

• Case presentation of a 9-month-old male diagnosed with congenital hypothyroidism.
• Detailed clinical course including diagnosis of hypocalcemia, hyperphosphatemia, and hyperparathyroidism.
• Review of pseudohypoparathyroidism literature, focusing on diagnostic challenges and congenital hypothyroidism misdiagnosis.

Key Points:

• A 9-month-old male presented with congenital hypothyroidism, later developing hypocalcemia, hyperphosphatemia, and hyperparathyroidism.
• The patient exhibited AHO features, leading to a diagnosis of PHP Ia with thyroid-stimulating hormone (TSH) resistance.
• This case highlights the importance of considering PHP Ia in infants with congenital hypothyroidism and AHO.

Conclusions:

• Children diagnosed with PHP Ia require thorough evaluation for associated endocrinopathies, including hormone resistance.
• Misdiagnosis of PHP Ia as congenital hypothyroidism is a significant concern.
• Early and accurate diagnosis of PHP Ia is essential for appropriate management and to prevent complications.