Silent Stroke (image) Washington University School of Medicine Caption The arrow points to evidence of a silent stroke. In patients with sickle cell anemia, such strokes often go undiagnosed because they do not cause immediate symptoms. Credit Robert McKinstry Usage Restrictions None 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.