Metastatic renal abscess mimicking Wilms' tumour.

Renal abscesses are uncommon in children, and usually present with a high fever and flank pain. We report a 9-year-old girl who presented with abdominal pain and cough. While the finding of multiple lung nodules and a renal mass prompted the initial diagnosis of Wilms' tumour, biopsy showed multiple renal abscesses with secondary lung involvement. The imaging findings and pathology correlation are provided.