renal failure | Renal failure | human pelvis | End stage renal disease | Renal Support Network | Renal tubular acidosis | Renal function | Renal Failure | Renal cell carcinoma |
Hydronephrosis — literally "water inside the kidney" — refers to distension and dilation of the renal pelvis and calyces, usually caused by obstruction of the free flow of urine from the kidney.