Hello , Hyperlidemia means your lipids consisting of cholesterol and triglycerides are on the higher side . Infarcts in the brain ( frontal is an area ) are strokes , as chronic and subacute are different time frame . It means there is something happening in your body which is predisposition you to have recurring stroke ( maybe silent in your case) . Lipids are on higher side is a definite risk factor Treatment for the lipids should be started as well as complete investigation, to find the cause should be done to prevent a future Stoke. Do send me all the investigation down till now and some history, so I can guide you for the further course of action . Regards Dr Priyank Mody