What Does Bilateral Frontal Ischemic Foci On MRI Suggest?

I perform MRI as a request of my ENT doctor prior to "functional endoscopic sinus surgery" . the report of MRI reported "subcortical arteriosclerotic leukoencephalopathy with bilaleral frontal ischemic foci " ... I do not complaining except mild memory defects .. sorry I forget to told you .. I am a female 54 years old still menstruating .. married and have 2boys and a girl .. 30 ..28 26 years old .. hypertensive &hypercholestrolemic since 16 years and receiving medications for this .. 4months ago I got DVT in the right saphenous vein and I am on "marivan" since then