I had an mri done an it says mild patchy white matter hyperintensity of the pons is stable likely representing microangiopathic disease mean what doe?

Small vessel disease: "microangiopathic" means "small vessel disease, " implying that you have some small blood vessel damage due to high blood pressure, diabetes, or high cholesterol ("hardening of the arteries"). This is your warning that chronic problems such as those (if you have any of them that you know of) need to be addressed.

Radiology talk: The reader of the imaging is suggesting that atherosclerosis is the cause of the white matter changes. These items can be nonspecific, and might better relate to prior migraines or cigarette smoking, or even prior head injury.