[Septo-optic dysplasia (de Morsier syndrome)].

Authors report a rare central nervous system malformation on giving account of three of their cases. The possibility of septo-optic dysplasia should be raised in children with unilateral or bilateral hypoplasia of the optic nerve. The use of neuroimaging technics is necessary for establishing the diagnosis. Knowing the disease is important because of the hypopituitarism which can accompany it, and which can necessitate an early hormone replacement therapy.