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Freebase(0.00 / 0 votes)Rate this definition: Hydronephrosis â literally water inside the kidney â 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.
What does mild hydronephrosis and hydroureter mean? A. Hydronephrosis is a condition in which there is distension of urinary collecting system in the kidney due to blockage of free flow of urine from the kidney.Hydroureter is distension of ureter which is a muscular tube that carries urine from kidney to bladder.Depending on severity of distension, this condition is classified as mild, moderate or severe. There are several causes of this condition-in elderly men, most common cause is prostate enlargement.. Hydronephrosis is a condition in which there is distension of urinary collecting system in the kidney due to blockage of free flow of urine from the kidney.