Pyelonephritis

Pyelonephritis (from Greek πήληξ – pyelum, meaning "renal pelvis", νεφρός – nephros, meaning "kidney", and -itis, meaning "inflammation") is an ascending urinary tract infection that has reached the pyelum or pelvis of the kidney. It is a form of nephritis that is also referred to as pyelitis. Severe cases of pyelonephritis can lead to pyonephrosis (pus accumulation around the kidney), urosepsis (a systemic inflammatory response of the body to infection), kidney failure and even death.