Fig. 1

Renal ultrasound at presentation. The patient’s kidneys were notable for small size, diffuse echogenicity and loss of corticomedullary differentiation. Average kidney size for 5-year-old children is 8 cm, however she was small for age, and for a 90 cm tall child the average kidney size is 7.1 cm with 95% prediction limits of 5.8 to 8.3 cm. The ultrasound was performed at the time she was anuric, hence the renal pelvis appears to be collapsed