Pyelonephritis: a kidney infection. Literally, pus in the kidneys (see a very early post of mine). I treated two such cases in the last two weeks. These were very sick cats, clinically affected with laboratory values consistent with pyelo (that's what we call if for short). Often, these cats don't read the textbook, but both of these did. Both were painful on kidney palpation, their total white blood cell counts were significantly increased, with mostly the neutrophil component increased, most consistent with infection. Their kidney values, notably the blood urea nitrogen (BUN) and creatinine were significantly affected, indicative of decreased...
