MRI Brain Image (IMAGE) Medical College of Wisconsin Caption The top MRI brain image shows a tumor surrounded with red, orange, yellow and green rings of normal tissue considered risk zones that could lead to neurological damage if removed. Credit Prism Usage Restrictions None License Licensed 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.