Homozygosity for a Mutation in the CYP11B2 Gene and GH Deficiency in a Child with Severe Growth Delay

Background: Isolated hypoaldosteronism is an autosomal recessive inherited disorder of terminal aldosterone synthesis, leading to selective aldosterone deficiency. Two different biochemical forms of this disease have been described, called aldosterone synthase deficiency or corticosterone methyl oxydase, types 1 and 2. In type 1, there is no aldosterone synthase activity and the 18 hydroxycorticosterone (18 OHB) level is low, whereas in type 2, a residual activity of aldosterone synthase persists and 18 OHB is overproduced. Objective and hypotheses: Isolated aldosterone synthase deficiency should be considered in neonates and infants with failure to thrive and salt wasting. Normal levels of…