School ager with fever and left flank pain

Genitourinary
CT of pediatric acute pyelonephritis followed by development of a renal abscess
Coronal CT without contrast of the abdomen (above) shows an enlarged left kidney with associated perinephric fat around its inferior pole. Sagittal (below left) and transverse (below left) ultrasound of the left kidney obtained 1 month later after antibiotic treatment shows a well-circumscribed, round, isoechoic lesion in the inferior pole of the left kidney.

The diagnosis was initially acute pyelonephritis of the inferior pole of the left kidney followed by development of a renal abscess in the inferior pole of the left kidney.

Published