Etiology Most causes of ghd are idiopathic Secondary causes Brain tumors most commonl craniopharyngioma CNS surgery · CNS radiation Anatomical abnormalities(eg, septooptic dysplasia, empty sella syndrome) ° Genetic ghd• Most causes of GHD are idiopathic • Secondary causes • Brain tumors, most commonly craniopharyngioma • CNS surgery • CNS radiation • Anatomical abnormalities (eg, septooptic dysplasia, empty sella syndrome) • Genetic GHD Etiology