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Plain abdominal radiographs of a 72-year-old man with fever, chills, dysuria, and right flank pain. Urinalysis showedproteinuria, pyuria, and gram-negative rods.
In a patient thought to have acute pyelonephritis, the presence of air encircling the kidney is pathognomonic of perinephricabscess. Drainage of this patient’s abscess yielded purulent material containing Proteus mirabilis .
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