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Pseudohypoparathyroidism in a mother and son: phenotypic variability and associated disorder
1Department of Pediatrics, Government Medical College and Hospital, Chandigarh. medinst@pgi.chd.nic.in
Insights
This study reports a rare inherited disorder, pseudohypoparathyroidism, in an infant presenting with hypocalcemic seizures and features of hypothyroidism. Investigations confirmed the condition, highlighting variability in its presentation.
Area of Science:
- Endocrinology
- Genetics
- Pediatrics
Background:
- Pseudohypoparathyroidism (PHP) is a rare genetic disorder characterized by resistance to parathyroid hormone.
- It often presents with characteristic physical features and biochemical abnormalities, including hypocalcemia and hyperphosphatemia.
- PHP can be associated with other endocrine deficiencies, such as hypothyroidism.
Observation:
- A 2-month-old infant exhibited clinical signs suggestive of hypothyroidism and presented with hypocalcemic seizures.
- The mother displayed phenotypic features that raised suspicion for pseudohypoparathyroidism.
- Initial thyroid function tests in the infant showed normal free thyroxine and mildly elevated thyroid-stimulating hormone levels.
Findings:
- Biochemical and endocrinological investigations confirmed pseudohypoparathyroidism in both the infant and the mother.
- Despite clinical and radiological indicators of hypothyroidism, the infant's thyroid hormone levels were within normal limits, with only a slight elevation in TSH.
- The case underscores the significant intra- and inter-patient variability in the clinical and biochemical manifestations of this rare inherited disorder.
Implications:
- This case highlights the importance of considering pseudohypoparathyroidism in infants presenting with hypocalcemia and apparent hypothyroidism.
- Recognizing the phenotypic variability is crucial for timely diagnosis and management of PHP.
- Further research into the genetic and molecular basis of PHP is warranted to understand its diverse presentations.
Abstract:
A 2-month-old infant with clinical features of hypothyroidism presented with hypocalcemic seizures. The maternal phenotypic features aroused the suspicion of pseudohypoparathyroidism which was confirmed in both by biochemical and endocrinological investigations. Though the child had clinical and radiological features to suggest hypothyroidism he had normal free thyroxine and only slightly elevated thyroid stimulating hormone levels. Special note is made of the intra and interpatient variability of this rare inherited disorder.