| Symptoms |
| Headaches (73 percent) |
| Vision abnormalities (47 percent) |
| Nausea and vomiting (40 percent) |
| Impaired ambulation (37 percent) |
| Signs |
| Papilledema (60 percent) |
| Ataxia (50 percent) |
| Loss of upward gaze (30 percent) |
| Tremor (20 percent) |
| Altered pupillary reflexes (17 percent) |
| Hyperactive deep tendon reflexes (13 percent) |
