Anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery (PICA) complexes are normal anatomical variations and it doesn't need any treatment.
Increased signal in the periventricular and subcortical white matter may be due to many reasons like ischemic changes involving small blood vessels(vasculitis),demyelination
Ischemic changes resulting from blood vessels changes in diseases like hypertension
So,you need monitoring of conditions that leads to ischemic changes like hypertension,altered lipid profile
,diabetes mellitus so that further progression of disease can be halted.
You need investigations like routine hemogram,RBS,LFT,RFT,Lipid profile,ultrasound of abdomen.
Proper treatment depend upon findings.
You also need follow up scan.