X-ray fluoroscopic cystometry (CG-CM) was carried out on 12 cases of pediatric vesicoureteral reflux (VUR) including 7 cases of non-obstructive VUR and 5 cases of neurogenic bladder (total 18 ureters). The following results were obtained. 1) The classification of VUR with CG-CM in the past reports was not based on analyses of cystometrogram (CMG) and not suitable for actual cases. A new classification to follow was proposed: Type I (low pressure reflux) during the resting pressure on CMG, Type

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... I (high pressure reflux) at the voiding reflex and Type III (high pressure reflux) at the voluntary voiding with abdominal pressure. 2) The average intravesical pressure at the initiation of VUR was 25.6 mmHg in Type I, 41. 4 mmHg in Type II and 86.3 mmHg in Type III. The average vesical capacity in the same period was 387. 9 ml in Type I, 245.6 ml in Type II and 53. 3 ml in Type III. Non-obstructive VUR tended to have a large vesical capacity, while neurogenic bladder a smaller one.