| MRI* Brain Site of Brainstem Lesions | BRT† Results Number of patients | |
|---|---|---|
| Abnormal BRT | Normal BRT | |
| Pons (only) | 19/21 | 2/21 |
| Pons + Medulla | 8/8 | 0/8 |
| Medulla (only) | 2/2 | 0/2 |
| Medulla + Midbrain | 1/1 | 0/1 |
| Midbrain (only) | 1/2 | 1/2 |
| Midbrain+Pons+Medulla | 1/1 | 0/1 |
| TOTAL | 32/35 (91.4%) | 3/35 (8.6%) |