Definitions for pyonephrosis
Pyonephrosis is an infection of the renal collecting system. Pus collects in the renal pelvis and causes distension of the kidney. It can cause kidney failure.
U.S. National Library of Medicine
Distention of KIDNEY with the presence of PUS and suppurative destruction of the renal parenchyma. It is often associated with renal obstruction and can lead to total or nearly total loss of renal function.
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"pyonephrosis." Definitions.net. STANDS4 LLC, 2013. Web. 5 Dec. 2013. <http://www.definitions.net/definition/pyonephrosis>.