FIGURE 1  Nephrostogram of the distal left ureter showing the region of obstruction (posteroanterior film).

From the following article:

A case of iatrogenic ureteric injury presenting with headache

Simon Phipps, Martin A Roder, Peter Aslan, Mark Brown and William Lynch

Nature Clinical Practice Urology (2008) 5, 113-116
doi:10.1038/ncpuro0998