Dept of Obstetrics and Gynecology, Hôpital Félix Guyon, rue des Topazes, 97400 Saint-Denis, Reunion Island, France. Ph : 0262 90 55 22.

This is a young woman scanned at 36 weeks of gestation. Her first two ultrasounds were normal. The current scan showed a normal left kidney. The right kidney was hypoplastic and hydronephrotic.

Transverse view of both kidneys. Note the difference in cross-section:

Parasagittal views demonstrating the difference in length (1st image = Right kidney, 2-3rd image: Left kidney)

The cortico-medullar differenciation of the two kidneys seems normal.