RENAL ABNORMALITIES ON ANTENATAL SCAN Supporting information

In males with posterior urethral valves diagnosed antenatally, can intrauterine drainage procedures provide benefit? A review on posterior urethral valves (PUV) (Dinneen, 1996) states: “PUV may be one of the conditions suitable for intrauterine intervention, but the timing and type of intervention has yet to be determined”. It is possible that renal dysplasia may be irreversible by the time it is first detected on ultrasound (Thomas, 1989), and even successful drainage procedures may not return bladder pressures to normal or completely resolve abnormalities of ureteral drainage (Gonzales, 1990). In the absence of any controlled trials, the evidence for successful prenatal intervention in PUV rests on a small number of case reports (Ropacka, 2001; Quintero, 2000; Shimada, 1998; Nguyen, 1996; Fournie, 1983).