Noun
An accumulation of urine in the pelvis of the kidney, occasioned by obstruction in the urinary passages.
Source: Webster's dictionaryBilateral hydronephrosis and renal papillary necrosis have also been reported in some cases. Source: Internet
Postrenal azotemia and hydronephrosis can be observed following the obstruction of urine flow through one or both ureters. Source: Internet