Adrenal Hypoplasia, Congenital, also known as x-linked adrenal hypoplasia congenita, is related to intrauterine growth retardation, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies and chromosome xp21 deletion syndrome. An important gene associated with Adrenal Hypoplasia, Congenital is NR0B1 (Nuclear Receptor Subfamily 0 Group B Member 1), and among its related pathways/superpathways are Diseases of glycosylation and Metabolism of steroids. Affiliated tissues include adrenal gland and adrenal cortex, and related phenotypes are oligozoospermia and hyperpigmentation of the skin