[Reliability of the combination of ultrasonography-cystography in the study of urinary infection in children. Prospective study on 90 cases].

The authors report a prospective study concerning 90 children with a urinary tract infection, investigated for the first time by radiological and ultrasonographic techniques. Amongst these 90 children, 50 (i.e. 55% of cases) had a normal retrograde cystography and ultrasonography. These children did not have any IVU and medical surveillance proved to be sufficient. Ten patients had a normal retrograde cystography and abnormal ultrasonography. Intravenous urography carried out in these 10 cases revealed in 8 instances an abnormality of the upper urinary tract. Finally 30 children had an abnormal retrograde cystography, with reflux in 29 cases, leading to intravenous urography which yielded a pathological result in only half of the cases studied. This series confirms the central role of retrograde cystography. When it is normal, intravenous urography may be legitimately substituted by ultrasonography.