Pelviureteric junction obstruction

Case contributed by Dr Mostafa El-Feky


Left loin pain

Patient Data

Age: 20 years
Gender: Male

CT Urography

Left kidney shows small size (7.5 cm in bipolar dimension), decreased parenchymal thickness and markedly dilated, ballooned renal pelvis and calyces with abrupt termination at the pelviureteric junction. No intraluminal or mural cause for obstruction detected. The left ureter is of normal caliber. Delayed contrast excretion at the left pelvicalyceal system and no contrast reaches left ureter at the excretory phase.

Case Discussion

 The radiological features likely represent chronic left pelviureteric junction obstruction.  In this case, there is branching of the left renal artery at the pelviureteric junction wrapping it horizontally that might be a probable etiology. 

CT urography is the modality of choice for differentiating pelviureteric junction obstruction from other causes of hydronephrosis and from parapelvic cysts. Excretion into the dilated calyces with a non-dilated ureter and abrupt transition at the pelviureteric junction is characteristic. The kidney showed delayed contrast excretion due to obstruction. 

Pelviureteric junction obstruction may be congenital or secondary to inflammatory stricture, kink or a renal artery branch crossing the renal pelvis. If untreated, it results in chronic hydronephrosis that leads to decreased parenchymal thickness and impaired function of the affected kidney.

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Case information

rID: 52261
Published: 5th May 2017
Last edited: 14th Aug 2019
System: Urogenital
Inclusion in quiz mode: Included
Institution: Dar El Ashaa Center

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