(A) Non–contrast-enhanced axial computed tomography (CT) image at the level of the adrenal glands shows that the right adrenal gland has been replaced by a mass (arrow) with a heterogeneous appearance due to areas of high and low attenuation. The attenuation has been measured at 48 Hounsfield units (HU). (B) Contrast-enhanced axial CT image at the same level as in Figure A obtained 60 seconds after the initiation of a contrast injection shows heterogeneous enhancement of the right adrenal mass (arrow). The attenuation has been measured at 88 HU. (C) Contrast-enhanced axial CT image at the same level as in Figures A and B obtained after a 10-minute delay shows persistence of the heterogeneous enhancement in the right adrenal mass (arrow). The attenuation has been measured at 78 HU.