We report two boys aged 1 year and 2 years 2 months, respectively, wit
h cystic nephromas. Both presented with a painless abdominal mass. Com
puted tomography showed a homogeneous, multicystic tumor of the lower
pole of the kidney in both cases with thin septa without solid parts.
Macroscopically, the surface of the tumor was:smooth. Both patients un
derwent a renal-sparing procedure; histology confirmed the diagnosis o
f cystic nephroma.