Hi and welcome,
There are actually different types of brain lesions with the most common being caused by Cerebral small vessel
disease, which is basically an umbrella
term with alternative names seen on MRI reports being Small vessel ischemic disease, White matter disease, Periventricular white matter changes, Perivascular chronic ischemic white matter disease of aging, Chronic microvascular changes, Chronic microvascular ischemic changes, White matter hyperintensities, Age-related white matter