hydronephrosis

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hydronephrosis (hy-droh-ni-froh-sis) n. distension and dilatation of the pelvis of the kidney. This is due to an obstruction to the free flow of urine from the kidney. Surgical relief by pyeloplasty is advisable to avoid the back pressure atrophy of the kidney and the complications of infection and stone formation.
—hydronephrotic adj.

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