[New classification of vesicoureteral reflux]

Five illustrative cases of vesicoureteral reflux, of different age and sex, are described. All patients were submitted to urodynamic evaluation. A new classification based on the underlying cause is purported. Ureterovesical reflux may be passive or active. The latter type may be involuntary, voluntary or caused by abdominal pressure. In our view, this new classification could be useful in the management of vesicoureteral reflux.