Etiology of pelviureteric junction obstruction: Current evidence

A systematic review evaluated the underlying etiologies of pelviureteric junction obstruction. Twelve studies comprising a total of 513 patients were analyzed. Crossing vessels (50.5%), followed by intrinsic ureteral stenosis, adhesions, and high insertion of the ureter were reported. Obstruction secondary to crossing vessels was found as the most common cause of obstruction in adults and occurs more frequently in children.