NCIt definition : Dilation of the urinary collecting space in the kidney.;
Alternative definition : NCI-GLOSS: Abnormal enlargement of a kidney, which may be caused by blockage of the
ureter (such as by a kidney stone) or chronic kidney disease that prevents urine from
draining into the bladder.; FDA: A condition of excess urine accumulation in kidney(s) that causes swelling of
kidneys.;