The difference between epidural and subdural hematomas on CT is the shape and extent of the hematoma. Epidural hematomas are more limited in scope and appear on CT as a fusiform or pyknotic high-density shadow below the inner plate of the skull, sometimes with significant skull fractures. Acute subdural hematomas are divided into acute subdural hematomas and chronic subdural hematomas. Acute subdural hematomas appear on CT as a crescent-shaped high-density shadow below the inner plate of the skull and are more widespread, and the ipsilateral cerebral sulcus and cerebral gyrus can be seen to disappear from the frontal lobe to the occipital lobe. Sometimes a significant midline shift can be seen, often combined with cerebral contusions, which appear as multiple punctate or patchy high-density shadows in the brain on CT. Chronic subdural hematomas appear as isointense or hypointense crescentic shadows below the intracranial plate, without punctate high-density changes in the brain.