Lower urinary tract dysfunction plays significant role in patogenesis of vesicoureteral reflux (VUR). Thus, urodynamic assessment is very useful in diagnosis and treatment of VUR. OBJECTIVE Assessment of the incidence of urodynamic disturbances among children with VUR. METHODS Retrospective assessment of 125 children with VUR including 93 assessed urodymically. RESULTS Urodynamic disturbances were found in 58 patients (70.9% of examined children), of which--detrussor hyperactivity in 25 (43.1% of children with urodynamic disturbances), detrussor hyperactivity with subvesical obstruction or dysfunctional voiding in 6 (10.3%), dysfunctional voiding in 17 (29.3%), anatomical subvesical obstruction in 9 (15.5%), detrussor hypotony in 1 (1.7%). No disturbances were found in 27 (29.1% of examined children). Children with detrussor overactivity were the prevalent group among all children with lower urinary tract dysfunction. CONCLUSIONS Children with lower urinary tract dysfunction constitute a significant part of children with VUR.