Sagittal US of the left kidney (above) shows a moderate amount of hydronephrosis. Image from the excretory phase of an intravenous pyelogram exam (below left) shows a normal right renal collecting system and a markedly dilated left renal collecting system and proximal left ureter. Image from a retrograde ureteroscopy exam (below right) shows normal caliber of the distal and middle left ureter with a sharp area of narrowing in the proximal left ureter with a markedly dilated proximal left ureter above it.
