Scalp and Intracranial EEG in Medically Intractable Extratemporal Epilepsy with Normal MRI
Table 2
Clinical characteristics of patients.
Clinical characteristics
(%)
Mean
Range
36 patients
Age at surgery, years
27
8ā71
Age at onset
7.4
1ā19
Duration
19.5
2ā52
Female
14 (38%)
Location:
āfrontal
28 (78%)
āparietal
6 (17%)
āoccipital
2 (5%)
Presence of risk factor
14 (38%)
Presence of GTC seizure
14 (38%)
Pathology:
āgliosis
25 (70%)
āMCD
11 (30%)
Scalp EEG:
āGroup 1
12 (33%)
āGroup 2
8 (22%)
āGroup 3
9 (25%)
āGroup 4
7 (15%)
Ictal scalp EEG patterns:
āfocal Ictal Beta
6/30 (20%)
āother
24/30 (80%)
iEEG onset patterns
āFast frequency (>14āHz)
17/31 (55%)
āOther
14/31 (45%)
Localized SPECT
13 (36%)
Localized SISCOM
22 (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.