The patient presents with a small amount of subdural fluid, which is less serious. In this case, further cranial MRI is needed. This is because only a cranial MRI can screen whether it is specifically a subdural hemorrhage or a subdural fluid, and a cranial CT cannot distinguish this. If a small amount of subdural hemorrhage is found, long-term oral atorvastatin calcium is recommended, and this drug can help it to be absorbed. If it is absorbed, continue the oral medication. If it is not absorbed, you need to consider drilling and drainage surgery. If it is a small amount of subdural fluid, we can continue to monitor it dynamically. If there is no change, no treatment is needed.