School ager with suspected congenital anomaly of the urinary tract

IVP of pelvic kidney
AP image from the excretory phase of a vintage intravenous pyelogram shows a normal position of the right kidney in the right renal fossa. The left renal fossa is empty and the left kidney can be found in the left pelvis, over the left side of the sacrum.

The diagnosis was an ectopic kidney in the pelvis.