Prenatal diagnosis of renal anomalies

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Abstract
Within the past 24 months, we have performed prenatal diagnostic studies in 4 pregnancies known to be at risk for well-described genetic syndromes involving renal abnormalities, ie, Meckel syndrome, Roberts syndrome, and bilateral renal agenesis. The diagnostic techniques utilized were ultrasonographic scanning (B-mode and grey scale), biochemical assays, and radiographic evaluation. The ultrasound finding common to the 3 affected cases was extreme oligohydramnios, which we considered indirect evisdence that renal anomalies were present. The ultrasound scans of the fetuses affected with Meckel and Roberts syndromes demonstrated anechoic cystic spaces in the abdomen, representing the enlarged dysplastic cystic kidneys. An encephalocele was well documented by B-mode scan in the fetus with Meckel syndrome. The absence of normal limbs in the Roberts syndrome was evident on serial grey scale scans of the fetus. Biochemical and radiographic studies provided results consistent with the suspected diagnoses. The importance of providing genetic counseling and prenatal diagnosis to families at risk is emphasized.

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