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Acute Pyelonephritis
Etiology: ascending urinary tract infection or hematogenous infection
US: focal spherical swelling, hypoechoic, hypoperfused on color / power doppler US
CT: low density on contrast enhanced CT, striated nephrogram
DDX: renal tumor which will not resolve on antiobiotics
Clinical: focus of infection can progress to abscess
Cases of Acute Pyelonephritis
Immediate (above) and delayed (below) axial CT with contrast of the abdomen shows multiple low density wedge-shaped lesions in the left kidney and a striated nephrogram on the delayed images.