Which findings suggest early renal papillary necrosis in acute pyelonephritis (kidney infection)?

Updated: Jul 01, 2021
  • Author: Tibor Fulop, MD, PhD, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Findings of early renal papillary necrosis include a dilated calyceal fornix, retracted or irregular papillary tip, and extension of contrast into the parenchyma. A club-shaped cavity in the medulla or papilla may be formed in later disease. When a separated papilla is surrounded by contrast, a ring may be visualized, which is characteristic of papillary necrosis.

For more information on this topic, see Papillary Necrosis.

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