Abstract:
PURPOSE:Lesion-negative refractory partial epilepsy is a major challenge in the assessment of patients for potential surgery. Finding a potential epileptogenic lesion simplifies assessment and is associated with good outcome. Here we describe imaging features of subtle parahippocampal dysplasia in five cases that were initially assessed as having imaging-negative frontal or temporal lobe epilepsy. METHODS:We analyzed the clinical and imaging features of five patients with seizures from the parahippocampal region. RESULTS:Five patients had subtle but distinctive magnetic resonance imaging (MRI) abnormalities in the parahippocampal gyrus. This was a unilateral signal abnormality in the parahippocampal white matter extending into gray matter on heavily T(1)- and T(2)-weighted images with relative preservation of the gray-white matter boundary on T(1)-weighted volume sequences. Only one of these patients had typical electroclinical unilateral temporal lobe epilepsy (TLE); one mimicked frontal lobe epilepsy, two showed bitemporal seizures, and one had unlocalized partial seizures. All have had surgery; four are seizure-free (one has occasional auras only, follow-up 6 months to 10 years), and one has a >50% seizure reduction. Histopathologic evaluation suggested dysplastic features in the surgical specimens in all. DISCUSSION:In patients with lesion-negative partial epilepsy with frontal or temporal semiology, or in cases with apparent bitemporal seizures, subtle parahippocampal abnormalities should be carefully excluded. Recognizing the MRI findings of an abnormal parahippocampal gyrus can lead to successful surgery without invasive monitoring, despite apparently incongruent electroclinical features.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
Pillay N,Fabinyi GC,Myles TS,Fitt GJ,Berkovic SF,Jackson GDdoi
10.1111/j.1528-1167.2009.02103.xsubject
Has Abstractpub_date
2009-12-01 00:00:00pages
2611-8issue
12eissn
0013-9580issn
1528-1167pii
EPI2103journal_volume
50pub_type
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