Congenital adrenal hyperplasia due to 11-hydroxylase enzyme deficiency in three siblings. A brief report.

To appraise clinicians of the presence of an uncommon cause of congenital adrenal hyperplasia in a Nigerian family, we present case reports of three siblings comprising two males (aged 4 years 10 months and 3 years 10 months) and a female (aged 16 months). The male patients presented with features of precocious pseudopuberty and had body weights and heights that were above the 95th percentiles on a standard growth chart. There was radiologic evidence for an advanced bone age of over 11 years in both patients, together with findings of sustained systemic hypertension. The female patient was discovered to have an abnormal hormonal profile during a screening of the unaffected children of their non-cosanguinous monogamous parents. The three siblings had morning plasma cortisol concentrations in the lower range of reference values together with markedly elevated levels of plasma androgens. These biochemical abnormalities together with the clinical features of precocious pseudopuberty in the two male patients led to the clinical suspicion of congenital adrenal hyperplasia (CAH). The enzymatic defect was believed to be due to 11-hydroxylase enzyme, because of the presence of sustained systemic hypertension in the male subjects. As routine family screening was instrumental in the discovery of the subclinical CAH in the female subject, it is thus suggested that clinicians should endeavour to undertake a detailed hormonal screening of family members of patients.