Left renal hilar lesion showing the degree of eccentric enhancement that is similar to the vascular blood pool is highly suggestive of a vascular lesion. A partially thrombosed saccular aneurysm is seen arising from distal left renal artery after its bifurcation.

Hypoperfused left renal posterior cortex (at risk of ischemia and infarction) possibly related to a localized mass effect of this lesion on its vascular supply.