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Wikipedia definition
1. HydronephrosisHydronephrosis - literally "water inside the kidney" - refers to distension and dilation of the renal pelvis and calyces, usually caused by obstruction of the free flow of urine from the kidney. Untreated, it leads to progressive atrophy of the kidney. In cases of hydroureteronephrosis, there is distention of both the ureter and the renal pelvis and calices.
Read “Hydronephrosis” on English Wikipedia
Read “水腎症” on Japanese Wikipedia
Read “Hydronephrosis” on DBpedia

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