X-ray changes in the kidneys of children with orthostatic proteinuria.

In 38 patients with orthostatic proteinuria (O.P.) and in 31 children of the control group (C) roentgenograms of excretory urography have been compared, made in the standing erect and in the lying down posture. In children with O.P. significantly more frequent and more expressive ptosis of the kidneys during orthostasis was found than in the controls. In children with O.P. disturbed urine outflow was found in 36.8%, while in children of the control group only in 3.2%. On the basis of the results obtained relations between haemodynamic changes in ptosis of the kidneys, disturbed urine outflow and the origin of O.P. are analysed.