KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Acute pyelonephritis. Illustration of small abscesses (yellow) on the surface of a kidney in a case of acute pyelonephritis. Pyelonephritis may be either acute or chronic. The acute form is usually caused when bacteria causing cystitis spread up the ureters from the bladder. It causes fever and back pain. Treatment is with antibiotic drugs.
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