In a 4 1/2 year old blind boy with cryptorchidism and severe growth retardation a deficiency of growth hormone was verified. He has the symptoms of septo-optic dysplasia, an inborn malformation of the brain with hypoplasia of the optic nerves and tractus opticus, absent septum pellucidum and variable pituitary hormone deficiencies. Treatment with growth hormone was successful. In children with growth hormone deficiency the syndrome seems to be not infrequent.