| A sporadic, progressive, adult (>30 years of age)-onset disease characterized by: |
| Parkinsonism (bradykinesia with rigidity, tremor, or postural instability) or |
| A cerebellar syndrome (gait ataxia with cerebellar dysarthria, limb ataxia, or cerebellar oculomotor dysfunction) and |
| At least one feature suggesting autonomic dysfunction (otherwise unexplained urinary urgency, frequency, or incomplete bladder emptying; erectile dysfunction in males; or significant orthostatic blood pressure decline that does not meet the level required in probable MSA) and |
| At least one of the additional features of possible MSA* |
