Chronic pelviureteric junction obstruction (IVP)
Patient presents with sensation of a left flank mass.
Intravenous pyelogram (IVP)
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Left-sided hydronephrosis and delayed contrast excretion with marked pelvic dilatation and non dilated ureter, suggesting stenosis of the pelviureteric junction.
This case demonstrates typical appearances of pronounced left pelviureteric junction obstruction, likely to be congenital.