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Definition of Hydronephrosis

Hydronephrosis: Distention of the kidney with urine. Hydronephrosis is caused by obstruction of urine outflow (for example, by a stone blocking the ureter).

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=3828
Last Editorial Review: 3/19/2012

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