hydronephrosis

noun
hy·dro·ne·phro·sis | \-ni-ˈfrō-səs \
plural hydronephroses\-ˌsēz \

Medical Definition of hydronephrosis 

: cystic distension of the kidney caused by the accumulation of urine in the renal pelvis as a result of obstruction to outflow and accompanied by atrophy of the kidney structure and cyst formation

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