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Coexistent autosomal recessive polycystic kidney disease and UPJ obstruction. Prenatal sonographic findings.

Autosomal recessive polycystic kidney disease (ARPKD), also known as infantile polycystic kidney disease, is an inherited disorder affecting the collecting tubules of the kidney. Characteristic sonographic findings have been reported for both the fetus and neonate.1-1 Renal function in affected fetuses is virtually absent, resulting in severe oligohydramnios and pulmonary hypoplasia. We recently observed a case by prenatal sonography in which there was both ARPKD and ureteropelvic junction obstruction (UPJ). To our knowledge, this association has not been reported previously. This association, while rare, alters the typical findings of ARPKD and may result in misdiagnosis.