In this investigation of the patient's ileal conduit (loopogram), the right kidney fills quickly. The right upper tract is mildly dilated, which is not unexpected for a retrograde study of the kidney.
The left kidney, however, does not fill readily. Eventually a small amount of contrast opacifies the distal left ureter. When the patient is turned into a steep RPO, a short segment narrowing/stricture at the ureteral anastomosis is evident.
On the post void images (draining the conduit), the right upper collecting system decompresses, but the left does not decompress very well and retains a faintly dilated appearance.