Ureteropelvic junction obstruction
Long standing left flank pain.
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Left side significantly dilated collecting system especially renal pelvis, well opacified in delayed images. Non opacification of left ureter during the examination.
Right side normal nephrogram and pyelogram.
Uretero-pelvic junction obstruction (UPJO) is a well known cause of congenital obstructive uropathy and one of the commonest causes of antenatal hydronephrosis. Many cases are asymptomatic and identified incidentally, while in symptomatic cases, the complaint can be recurrent urinary tract infections, stone formation and even a palpable flank mass.