Cerebellar symptoms and associated deficits at presentation and during subsequent course.
| Symptom | Patient 1 | Patient 2 | Patient 3 | Patient 4 | Patient 5 | Patient 6 |
| Gait ataxia | At onset | At onset | At onset | Subsequent | At onset | Subsequent |
| Hand incoordination | Late | At onset | Late | Late | Late | At onset |
| Dysarthria | Late | Late | Late | Late | Late | At onset |
| Diplopia | Late | Late | At onset | |||
| Nystagmus | Late | At onset | ||||
| Vertigo | Late | Late | ||||
| Dizziness “unspecified” | At onset | |||||
| Hearing impairment | At onset | At onset | ||||
| Peripheral neuropathy | At onset | At onset | ||||
| Extrapyramidal features | At onset | At onset |