Figure 3

(a) Unenhanced images show a left adrenal mass (arrow) which measures 36 HU. (b) This has an HU of 109 on the enhanced and (c) 76 on the delayed image. By enhancement washout calculations this mass has a washout of 45%, which is diagnostic of a non-adenoma. On subsequent surgical resection, this was a pheochromocytoma.