<prompt> There is a high risk of renal dysplasia inPosterior urethral valve.Bladder exstrophyAnorectal malformationNeonatal sepsis  <response>: Ans. is a Posterior urethral valve The term renal dysplasia is technically a histological diagnosis. It occur due to abnormality in metanephric differentiation and is characterized histologically by the persistence in the kidney of abnormal structures - cartilage, undifferentiated mesenchyme and immature collecting ductules and by abnormal lobar organization.CF of Renal dysplasiaIt can be unilateral or bilateral and is almost always cysticKidney is enlarged, extremely irregular and multicystic. presents as a flank massIn unilateral dysplastic kidney the prognosis is good, where as in BL dysplastic kidney renal failure may ultimately result.Dysplastic kidney is associated with -posterior urethral valve as part of VURD syndromeV - posterior urethral valves U - unilateral refluxR D- renal dysplasiaUretero pelvic obstructionUreteral agenesis or atresiaOther anomalies of lower urinary tract. 