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Congenital Nephrotic Syndrome, Finnish Type

Renal sonography was ordered for a male term neonate 5 hours old with low urine output and massive proteinuria. Sonography showed the kidneys to be echogenic with anechoic pyramids, which contained microcysts bilaterally (Fig. 1). The kidneys were also shown to be enlarged; the right measured 7.1 cm, and the left was 7.2 cm (average length for a neonate of this age should be 4.5 cm). A biopsy was performed 2 days later, finding congenital nephrotic syndrome of the Finnish type.