1.4.2 Persistent aura without infarction

A man reports his fourth attack of a visual aura affecting the left side of his sight, describing bright shimmering shapes, a clearly positive visual phenomenon rather than a blind spot, confined entirely to the left. A headache began within the hour of the visual symptoms starting and has run alongside them without a clear break; remarkably, both the visual disturbance and the headache are still present today, now just over a week since onset. He denies any weakness, slurred speech or confusion during this time, and reports no fever or neck pain. He says a scan confirmed no infarct on imaging.