VESICO-VAGINAL REFLUX
V esicovaginal reflux is a well-known entity rarely encountered by radiologists. It is a behavioural disorder, a type of dysfunctional elimination syndrome commonly encountered in pre-pubertal girls. It is defined as reflux of urine into the vaginal vault either in supine or upright position during voiding. The clinical presentation varies from asymptomatic bacteriuria, dysuria, recurrent urinary tract infections, vulvovaginits to post-voiding incontinence. Although usually diagnosed clinically, radiological diagnosis is usually made by complete resolution of hydrocolpos on a post-voiding scan. It is important for the radiologist to be aware of this entity so as to differentiate this functional disorder presenting as hydrocolpos from other obstructive causes of hydrocolpos which require surgical management. Vesicovaginal reflux is a common cause of urinary incontinence in girls. A micturating cystourethrogram, which is the diagnostic investigation of choice, can demon-strate retrograde filling of the vagina during micturition and the complete emptying of the vagina at the end of micturition. Vesicovaginal reflux is a rare cause of gross hydrocolpos occurring without any anatomical obstruction. The condition may be associated with func-tional voiding disturbances.