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 Indian J Med Microbiol  
 

Figure 4 (A-C): Crossing vessel causing ureteric compression. (A) IVU showing grade-2 to -3 hydronephrosis with a grossly dilated pelvi-urteric segment and no cause for obstruction. (B) retrograde pyelography showing the catheter tip (upper arrow) to be superior and medial to the obstructed ureter (lower arrow) suggesting that this segment might be hooked around the IVC. (C) coronal MRU section showing a vessel (arrow) crossing at the site of ureteric narrowing, yielding the diagnosis

Figure 4 (A-C): Crossing vessel causing ureteric compression. (A) IVU showing grade-2 to -3 hydronephrosis with a grossly dilated pelvi-urteric segment and no cause for obstruction. (B) retrograde pyelography showing the catheter tip (upper arrow) to be superior and medial to the obstructed ureter (lower arrow) suggesting that this segment might be hooked around the IVC. (C) coronal MRU section showing a vessel (arrow) crossing at the site of ureteric narrowing, yielding the diagnosis