1. Figure 13b.  Assessment of stent jet patency in a patient with a transplanted kidney in the right iliac fossa who presented with deteriorating renal function. (a) US image shows moderate hydronephrosis. The upper end of the stent is difficult to identify. (b) US image shows the lower end of the stent (arrow) in the bladder. No jets emanating from the stent could be identified at color or power Doppler US. (c) Repeat US image obtained following stent replacement demonstrates resolution of the hydronephrosis. Note the stent (arrow) in place in the collecting system. (d) Power Doppler US image demonstrates a jet emanating from the bladder loop (arrow).