Primary megaureter

Case contributed by Dr Chris O'Donnell


Presents with acute abdominal pain. US shows marked right hydronephrosis and hydroureter. CT for clarification of the cause.

Patient Data

Age: 65
Gender: Female

Markedly distended right renal pelvis and ureter (up to 4 cm in diameter) with tortuosity down to a tapered distal ureter (arrow) at the bladder. No calculus and minimal calyceal dilatation without cortical atrophy as would be expected in a chronically obstructed or refluxing collecting system.

Case Discussion

Megaureter in an adult is often due to distal obstruction, occasionally gross reflux or commonly idiopathic (i.e. developmental). Even if idiopathic the patient can be symptomatic due to urinary stasis leading to recurrent infection or calculi. The key to diagnosing an idiopathic cause is the absence of obstruction on a frusemide nuclear renal scan, lack of reflux on MCUG and the absence of calyceal dilatation and renal parenchymal thinning as would be expected in a chronically obstructed kidney that could lead to such ureteric dilatation.

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Case information

rID: 26666
Published: 2nd Jan 2014
Last edited: 18th Nov 2015
System: Urogenital
Inclusion in quiz mode: Included

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