I had an mri and it shows t2 flair and hyperintensities on both anterior and posterior ovale.what does it mean?

It's concerning : While t2/flair signal hyper-intensities are not very specific and may represent many things, if you are 21 y/o it's concerning as you shouldn't have any. We need to look at the morphology and distribution of these signal abnormalities in a clinical context. What are your symptoms? At this point I am most worried about demyelinating conditions (i.e. Ms) and highly recommend seeing a neurologist.