Ultra-high-res MRI Reveals Migraine Brain Changes (IMAGE) Radiological Society of North America Caption (A) Enlarged centrum semiovale (CSO) perivascular spaces (PVS) (arrows) on sagittal T1-weighted MRI in a case with chronic migraine. (B) Migraine-free control without enlarged CSO PVS. Credit RSNA and Wilson Xu Usage Restrictions May use with credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.