Table 5.

Symptom Types^[Note]

Examination and Degree	Observation
Radiological:
Major	MRI white matter lesions in MCPs and or brain stem
Minor	MRI white matter lesions in cerebral white matter
Minor	Moderate-to-severe generalized atrophy
Clinical:
Major	Intention tremor
Major	Gait ataxia
Minor	Parkinsonism
Minor	Moderate-to-severe short-term memory deficiency
Minor	Executive function deficit

Note.— Inclusion criterion: CGG repeat 55–200.