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What is CT equation used to characterize adrenal lesions? and what are the cutoff points for adenoma?
CT washout rate. The cut-off points to diagnose adrenal adenoma are: >60% absolute washout, or >40% relative washout
- left suprarenal mass lesion is seen measuring 4.7 x 3.6 x 4.2 cm. It shows homogeneous postcontrast enhancement with clear fat planes around.
- it shows enhancement as follows:
- unenhanced phase = 37 HU.
- enhanced phase = 71 HU.
- delayed phase = 45 HU.
- absolute washout = 76 %
- liver: mildly enlarged with marked diffuse fatty infiltration