Presentation
Chronic dull left flank pain. Ultrasonography reported left sided hydronephrosis without nephrolithiasis.
Patient Data
Age: 50 years
Gender: Female
From the case:
Crossing vessels causing uretero-pelvic junction obstruction
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Left sided grade II hydronephrosis (according to Onen's grading) without parenchymal loss.
No nephrolithiasis or hydroureter.
Left renal vein branches cross the ureteropelvic junction before joining the renal hilum. This results in extrinsic compression of the pelviureteric junction; best seen on coronal images.
Case Discussion
Crossing vessels causing pelviureteric junction obstruction is a known entity. Contrast enhanced CT can demonstrate the vascular branches crossing and causing extrinsic compression over the pelviureteric junction.
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