Table 2.
Etiologic characteristics of cohort (presented as n, %).
| Genetic etiologies | |
| Channelopathies | |
| SCN1A mutation | 2 (1) |
| Infantile developmental encephalopathies | |
| CDKL5 mutation | 1 (1) |
| PCDH19 mutation | 1 (1) |
| MECP2 mutation | 1 (1) |
| MECP2 duplication | 1 (1) |
| Chromosomal anomalies | |
| Trisomy 21 | 3 (2) |
| Microdeletions and microduplications | 5 (4) |
| Neurometabolic abnormalities | |
| Mitochondrial | 4 (3) |
| Cerebral malformations | |
| Focal cortical dysplasia | 12 (9) |
| Polymicrogyria | 4 (3) |
| Lissencephaly | 5 (4) |
| Band heterotopia | 3 (2) |
| Gray matter heterotopia | 1 (1) |
| Tuberous sclerosis | 1 (1) |
| Aicardi syndrome | 2 (1) |
| Other | 12 (9) |
| Acquired insults | |
| Cerebrovascular | |
| Perinatal stroke | 5 (4) |
| Hypoxic ischemic encephalopathy | 1 (1) |
| Traumatic brain injury | 1 (1) |
| Infection | 1 (1) |
| Unknown etiology | 68 (51) |