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Compensatory growth after HLA-typing revelation of incorrect diagnosis of 21-hydroxylase deficiency
Insights
Human Leukocyte Antigen (HLA) typing unexpectedly excluded a congenital adrenal hyperplasia diagnosis, allowing safe withdrawal of hydrocortisone. This led to compensatory growth and resolution of adrenal insufficiency crises, demonstrating potential recovery of adrenocortical function.
Area of Science:
- Endocrinology
- Genetics
- Pediatric Endocrinology
Background:
- A pediatric patient previously diagnosed with 21-hydroxylase deficiency (a form of congenital adrenal hyperplasia) was undergoing long-term hydrocortisone replacement therapy.
- The family sought Human Leukocyte Antigen (HLA) typing to determine carrier status, a standard genetic testing procedure.
Observation:
- HLA typing results contradicted the initial diagnosis of 21-hydroxylase deficiency.
- Following genetic testing, the patient's hydrocortisone replacement therapy was discontinued.
- The patient exhibited significant compensatory growth and experienced no further adrenal insufficiency crises.
Findings:
- Discontinuation of even low-dose hydrocortisone, previously undetected as excessive, allowed for improved growth.
- The patient's adrenocortical function demonstrated a complete recovery after many years of exogenous steroid treatment.
- HLA typing served an unanticipated role in correcting a diagnostic error.
Implications:
- This case highlights the importance of reassessing diagnoses, even after long-term treatment, using advanced genetic tools like HLA typing.
- It underscores that exogenous steroids, even at sub-clinical overdose levels, can significantly impair growth in children.
- The findings offer reassurance regarding the potential for full recovery of adrenal function after prolonged steroid therapy.
Abstract:
A 9 1/2 year old boy had been treated for complete 21-hydroxylase deficiency from infancy. That diagnosis was excluded by HLA-typing of family members who wished to know their carrier status. Withdrawal of replacement therapy was very well tolerated. The patient showed distinct compensatory growth and for the first time was free of crises of adrenal insufficiency. This instance demonstrates an unexpected application of HLA-typing. It also shows that an amount of hydrocortisone too small to give any clinical evidence of overdose can impede growth. Furthermore, it provides reassurance that adrenocortical function can recover completely after many years of treatment with exogenous steroids.