Incidental cystic renal cell carcinoma on computed tomography

Axial (arrow, A) and coronal (arrowhead, B) CT images following contrast for left-sided pain show an incidental, indeterminate right renal mass. Dedicated kidney CT imaging before (dashed arrow, C) and after (small arrows, D, E) intravenous contrast administration confirms nodular enhancing components consistent with a Bosniak IV lesion, cystic renal cell carcinoma on resection.