Increased renal echogenicity in the neonate.

We report data on newborn infants with increased renal echogenicity observed at the Division of Neonatal Intensive Care of Pavia during a five-year period. Review of 1600 abdominal ultrasonic evaluations revealed 103 newborn infants (56 females and 47 males, with birth weight from 560 to 3700 g and gestational age from 25 to 42 weeks) whose kidneys showed increased echogenicity. Three patients with infantile polycystic kidney disease, two with renal candidiasis, three with dysplastic kidney and two with renal vein thrombosis showed diffuse hyperechogenicity. Three patients with hemolytic-uremic syndrome showed cortical hyperechogenicity. Increased medullary echogenicity was observed in 90 infants with renal disease secondary to perinatal asphyxia. In 76 of these patients the evaluation of renal echogenicity and the renal function improved, while in the remaining 14 newborns the renal alteration persisted until death.