ABSTRACT

The cortical changes persist until 6 to 24 months of age, at which time the kidney changes to the adult pattern. The amount of renal pelvic fat increases gradually during adolescence. Infants and young children continue to have better differentiation of cortex from the medulla on the ultrasound image, but this is because they usually are slim and higher frequency transducers often are used. Similar appearances may be found in slim adults.