TABLE 1:

Demographic, clinical, and imaging features of SSPE cases

Patient/Age, y/Sex	Vaccination	Age at Measles Infection	Time after Diagnosis	Stage at Diagnosis	Clinical and Neurologic Findings	MRI Findings
Stage II at MRS
1/8/F	No	7 mo	1 y	II	Choreoathetosis, myoclonus, difficulty speaking, tonic convulsion, mental deterioration	Normal
2/8/M	Yes	NA^*	6 mo	II	Myoclonus, ataxia, spasticity, tonic-clonic seizures, difficulty speaking	Normal
3/6/F	Yes	12 mo	9 mo	II	Myoclonus, ataxia, mental deterioration, walking with assistance	Normal
Stage III at MRS
1/8/M	Yes	11 mo	4 y	II	No speech, decerebrate rigidity, bedridden, no responsiveness to any stimulus	Cerebral, cerebellar, and brainstem atrophy, periventricular hyperintensities
2/8/M	No	6 mo	3 y	II	No speech, opisthotonos, decerebrate and decorticate rigidity, no responsiveness to any stimulus, bedridden	Cerebral and cerebellar atrophy, periventricular hyperintensities
3/7/F	Yes	16 mo	2 y	II	Decerebrate rigidity, bedridden, no speech	Cerebral and cerebellar atrophy, periventricular hyperintensities