Septooptic dysplasia (SOD) is a clinically heterogeneous disorder characterized by the classical triad of optic nerve hypoplasia, pituitary hormone abnormalities and midline brain defects. The disease is Septo-optic dysplasia (Orphanet_3157, an Orphanet rare-disease nomenclature identifier). Also known as: De Morsier syndrome, SOD, Septo-optic dysplasia spectrum.