CT
Axial non-contrast
Axial C+ arterial phase
Axial C+ portal venous phase
Axial C+ delayed
Axial ROIs HU
The left adrenal gland demonstrates a soft tissue mass (27HU on non-contrast phase) which demonstrates prominent arterial enhancement peripherally and gradually fills in. It remains a similar attenuation to the aorta on all sequences including delayed scans.
Incidental note is made of a simple (grade 1) renal cyst on the left.
Conclusion:
The features indeterminate and a malignant lesion (e.g. adrenal metastasis or adrenal carcinoma) cannot be excluded.