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Epilepsy classification and additional definitions in occipital lobe epilepsy
Kutluhan Yilmaz1, Elif Yüksel Karatoprak2
1Ordu University, Faculty of Medicine, Department of Pediatrics, Child Neurology.
Insights
Occipital lobe epilepsy (OLE) in children can present atypically. Typical symptoms of Panayiotopoulos syndrome and late-onset occipital lobe epilepsy of Gastaut do not always correlate with primary epilepsy causes.
Area of Science:
- Pediatric Neurology
- Epileptology
- Clinical Neuroscience
Background:
- Occipital lobe epilepsy (OLE) is a distinct epilepsy syndrome in children.
- Panayiotopoulos syndrome and late-onset occipital lobe epilepsy of Gastaut (OLE-G) are specific OLE subtypes with characteristic ictal symptoms.
- Understanding the relationship between these subtypes and epilepsy etiology is crucial for accurate diagnosis and management.
Purpose of the Study:
- To evaluate children with OLE, comparing those with characteristics of Panayiotopoulos syndrome and OLE-G.
- To investigate the correlation between specific OLE presentations and underlying etiology (primary vs. secondary).
- To assess the need for refined classification and terminology in OLE.
Main Methods:
- Categorization of 108 OLE patients into six groups based on ictal symptoms (autonomic/visual) and etiology (primary/secondary).
- Comparison of groups regarding seizure semiology, etiology, neuroimaging, EEG findings, treatment, and outcomes.
- Analysis of OLE patients exhibiting typical Panayiotopoulos syndrome or OLE-G features versus those without.
Main Results:
- Half of OLE patients had occipital epileptiform activity; generalized activity was rare.
- Typical autonomic or visual symptoms were not exclusive to primary OLE.
- Refractory epilepsy was significantly more common in secondary OLE (29%) compared to primary OLE (1%).
Conclusions:
- The presence of typical autonomic or visual ictal symptoms in OLE does not reliably predict a primary (genetic/idiopathic) etiology.
- Primary OLE may present without these characteristic symptoms.
- Current classifications may be insufficient, necessitating new terminology to differentiate diverse OLE presentations in clinical practice and research.
Aim:
To evaluate epileptic children with occipital lobe epilepsy (OLE) in the light of the characteristics of Panayiotopoulos syndrome and late-onset occipital lobe epilepsy of Gastaut (OLE-G).
Methods:
Patients were categorized into six groups: primary OLE with autonomic symptoms (Panayiotopoulos syndrome), primary OLE with visual symptoms (OLE-G), secondary OLE with autonomic symptoms (P-type sOLE), secondary OLE with visual symptoms (G-type sOLE), and non-categorized primary OLE and non-categorized secondary OLE according to characteristic ictal symptoms of both Panayiotopoulos syndrome and OLE-G, as well as aetiology (primary or secondary). Patients were compared with regards to seizure symptoms, aetiology, cranial imaging, EEG, treatment and outcome.
Results:
Of 108 patients with OLE (6.4±3.9 years of age), 60 patients constituted primary groups (32 with Panayiotopoulos syndrome, 11 with OLE-G, and 17 with non-categorized primary OLE); the other 48 patients constituted secondary groups (eight with P-type sOLE, three with G-type sOLE, and 37 with non-categorized sOLE). Epileptiform activity was restricted to the occipital area in half of the patients. Generalized epileptiform activity was observed in three patients, including a patient with Panayiotopoulos syndrome (PS). Only one patient had refractory epilepsy in the primary groups while such patients made up 29% in the secondary groups.
Conclusion:
In OLE, typical autonomic or visual ictal symptoms of Panayiotopoulos syndrome and OLE-G do not necessarily indicate primary (i.e. genetic or idiopathic) aetiology. Moreover, primary OLE may not present with these symptoms. Since there are many patients with OLE who do not exhibit the characteristics of Panayiotopoulos syndrome or OLE-G, additional definitions and terminology appear to be necessary to differentiate between such patients in both clinical practice and studies.
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