What are the disadvantages of diagnostic ultrasonography (US) for acute pyelonephritis and when is renal angiography indicated?

Updated: Jul 01, 2021
  • Author: Tibor Fulop, MD, PhD, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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US findings may be falsely negative in 36% of cases of perinephric abscesses. Other drawbacks to US are the difficulty in differentiating kidney abscess from tumor and the difficulty in interpreting results in obese patients. Angiography may help differentiate kidney abscess from kidney tumor because an abscess often has increased peripheral vascularization, while the remainder of the mass is avascular.

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