TRUE supernumerary kidney is a rare anomaly.1 In a review of the literature Headings and Palmer2 found a total of 44 cases, of which 6 had extravesical ureteral orifices. A case reported by Shane3 and the following case bring the total number of cases of supernumerary kidney with a vaginal orifice to 8.A. G., a 7-year-old girl, was seen because of urinary incontinence, which had been present since birth but was apparent only when the child was on her feet. There had been no nocturnal enuresis since the age of 2. With the patient in the supine position there . . .