Your medications, Olmezest CH (olmesartan/chlorthalidone) for blood pressure and Eltroxin (levothyroxine) for your thyroid, play a key role in keeping your blood vessels and metabolism healthy. On a brain MRI, doctors typically look for any small vascular changes, which are very common as we age, especially with high blood pressure. Without the specific wording of your report, it is hard to give precise details, but keeping your blood pressure and thyroid levels well-controlled is the best way to protect your brain. Please share your specific MRI findings with your doctor for peace of mind.