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Classification and external resources
ICD-10 N13.6
ICD-9 590.0, 590.1, 590.8
eMedicine med/2851
MeSH C12.777.419.570.643.790

Pyonephrosis (Greek pyon "pus" + nephros "kidney") 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.[1]


This requires drainage, best performed by ureteral stent placement or nephrostomy.


Pyonephrosis is sometimes a complication of renal stones, which can be a source of persisting infection. It may also occur spontaneously. It can occur as a complication of Hydronephrosis or Pyelonephritis.

See also[edit]