A 32-year-old woman presents with acute pyelonephritis confirmed by clinical findings and urinalysis. Renal ultrasound with color Doppler is performed. The structure marked **A** in the diagram shows wedge-shaped hypoperfusion on color Doppler. Which of the following best explains the pathophysiology underlying this imaging finding?
A 28-year-old woman presents with 2 days of high-grade fever with rigors, severe right flank pain with costovertebral angle tenderness, dysuria, and vomiting. Urinalysis shows marked pyuria, WBC casts, positive nitrites, and bacteriuria. Renal ultrasound with color Doppler reveals mild global kidney enlargement with preserved corticomedullary differentiation. The structure marked **A** (wedge-shaped hypoperfused area in the upper pole) is identified on color Doppler imaging. What is the most likely diagnosis and what does this finding represent?
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