The authors report the case of a supernumerary kidney with pelvic ectopy in a 22-year-old man complaining of dysuria with leukocyturia and sterile urine. Urography, ultrasonography, C.T. and endoscopic probe revealed a small, supernumerary kidney in the left side of the pelvis between the bladder and the seminal vesicles with short ureter ending in ureterocele. Symptoms cleared up thanks to the quick pharmacological treatment so that no further ureterocele endoscopic probe was considered necessary, to avoid submitting the patient to the risk of secondary vesicles ureteral reflux and subsequent sepsis requiring difficult nephroureterectomy.
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