Clinical Study

Scalp and Intracranial EEG in Medically Intractable Extratemporal Epilepsy with Normal MRI

Table 2

Clinical characteristics of patients.

Clinical characteristics š‘ (%)MeanRange
36 patients

Age at surgery, years278ā€“71
Age at onset7.41ā€“19
Duration19.52ā€“52
Female14 (38%)
Location:
ā€ƒfrontal28 (78%)
ā€ƒparietal 6 (17%)
ā€ƒoccipital 2 (5%)
Presence of risk factor14 (38%)
Presence of GTC seizure14 (38%)
Pathology:
ā€ƒgliosis25 (70%)
ā€ƒMCD11 (30%)
Scalp EEG:
ā€ƒGroup 112 (33%)
ā€ƒGroup 2 8 (22%)
ā€ƒGroup 3 9 (25%)
ā€ƒGroup 4 7 (15%)
Ictal scalp EEG patterns:
ā€ƒfocal Ictal Beta6/30 (20%)
ā€ƒother24/30 (80%)
iEEG onset patterns
ā€ƒFast frequency (>14ā€‰Hz)17/31 (55%)
ā€ƒOther14/31 (45%)
Localized SPECT13 (36%)
Localized SISCOM22 (61%)

GTC: generalized tonic clonic seizure.
MCD: malformation of cortical development.
IED: interictal epileptiform discharge.
Group 1: localized IED; Group 2: lateralized but not localized IED; Group 3: generalized or bilateral IED; Group 4: no IED.