A patient treated for acute pyelonephritis 10 days ago prese…
A patient treated for acute pyelonephritis 10 days ago presents with persistent flank pain and leukocytosis. Ultrasound demonstrates a thick-walled fluid collection with internal septations and echoes located between the renal capsule and Gerota’s fascia. What focal infectious fluid collection has developed as a complication of this disease process?
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