Fig. 1

Renal magnetic resonance imaging demonstrating a 9-mm solid lesion in the right upper pole cortex. A Axial T1-weighted sequence (unenhanced): the cortical lesion is isointense to the renal cortex. B Axial T1-weighted sequence (portal phase, contrast-enhanced): the lesion shows mild enhancement. C Axial T1-weighted subtracted sequence (arterial phase): nodular image without intense enhancement. D Axial T2-weighted sequence: the cortical lesion is T2 isointense compared with the renal cortex