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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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