Preschooler with febrile seizure and abdominal pain

CT and US of renal abscess
Axial (left upper) and coronal (right upper) CT with contrast of the abdomen shows a round low density lesion in the lower pole of the left kidney. Transverse (lower left) and sagittal (lower right) color doppler US of the the left kidney shows the round lesion in the lower pole to be solid and avascular in nature.

The diagnosis was renal abscess.