Just added a nice case, of pelvic kidney in a neonate at: http://www.ultrasound-images.com/ped-abdomen.htm The child had an imperforate anus with suspected recto-uterine fistula. Placed the high resolution ultrasound probe on the pelvis and saw a pelvic kidney, the left kidney not being seen in the left renal fossa. A clear example of renal ectopia! I have added 7 ultrasound images for this case of pelvic kidney at the link above. This page is freshly created and devoted to pediatric abdomen. What was interesting was that the pelvic kidney appeared round or oval in shape, suggestive of some degree of malrotation of the renal axis.