| Classification | Description | Notes |
| Acute Epidural Hematoma | Convexo-convex | Hyperdense |
| Acute Subdural Hematoma | Convexo-concave | Hyperdense |
| Subacute Subdural Hematoma | Convexo-concave | Isodense |
| Chronic Subdural Hematoma | Convexo-concave | Hypodense |
| Acute-on-Chronic Subdural Hematoma | Convexo-concave | Mixed density, often with membranes separating components |
| Subdural Hygroma | Convexo-concave | CSF density |
| Arachnoid Cyst | variable | CSF density |
| Subdural Empyema | Convexo-concave | Hypodense, enhancing |
| Subarachnoid Hemorrhage | Intra-sulcal | Hyperdense |
Note: Vertex subdural can be very difficult to see on axial images.