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Complicated pyelonephritis. 53 year-old-woman with left flank pain and fever. (a) B-mode US appreciates inhomogeneous, hypoechoic area (asterisk); (b) CEUS performed in the same session confirms the presence of an avascular lesion with a peripheral rim, consistent with abscess (asterisk); (c) Urographic phase CECT, performed for the clinical worsening of the patient, confirms the presence of abscess (asterisk) and hypo-perfused area (curved arrow) at the lower pole of the kidney.
