The scope of paediatric urology was defined in the 1960s and the basic knowledge of disorders to be treated was also established at that time. In the 1970s there was a considerable increase in our understanding of the physiological aspects of urinary tract malformations. In addition, the contributions that were made to paediatric urology by other disciplines in medicine and science were more and more appreciated. For instance, in the late 1960s all children with any disorder vaguely associated with the urinary tract underwent an intravenous urogram and voiding cystogram. An interested group of radiologists, however, effected a change in these concepts: they emphasised noninvasive and more precise functional studies involving far less radiation. Thus the understanding, diagnosis and management of various disorders of the urogenital tract have been tremendously improved by ultrasonography, renography and renal scan techniques, urodynamics, CT scan and magnetic resonance imaging (MRI).