Benign causes of acquired ureteropelvic junction obstruction: A uroradiologic spectrum

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Abstract
Five different benign causes of ureteropelvic junction obstruction in adults without prior obstructive history are presented: aortic aneurysm, renal cyst, xanthogranulomatous pyelonephritis, eosinophilic ureteritis, and a crossing blood vessel. Although uncommon, these etiologies warrant consideration when an adult patient presents with ureteropelvic junction obstruction without a prior history of obstruction.
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