[Renal atrophy in a child].

An acquired small kidney in a girl of 10 is reported. Interstitial pyelonephritis was the main cause for the shrinkage of the kidney, but very localised areas of renal dysplasia have also been found in this kidney, which happened to be completely destroyed in 34 months. In this meanwhile, the child had recurrent febrile urinary tract infections (clinically acute pyelonephritis). No malformation of the lower urinary tract was found in this child.