FLAIR hyperintensities in white matter
are usually non-specific. The description fits
that of Fazekas Grade 1 changes which are of no significance or worry, especially if you are above 40-50 years of age. However, if they worsen on follow up MRI
, especially in young patients (less than 40 years), it maybe an indicator for predisposition to development of dementia
early in life.
Rarely, these white matter hyperintensities can represent microvascular ischaemic diseases or demyelinating conditions but, such patients usually are markedly symptomatic for these and your mother does not seem to fit these.
Overall, these findings are probably normal for your mother's age and yopu don't need to worry about them.