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Occipital Lobe Seizure vs Migraine Aura — SCE Neurology MCQ

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EasyEpilepsy & Seizure DisordersOccipital Lobe Seizure vs Migraine AuraSCE Neurology

A 45-year-old man with focal epilepsy on lamotrigine presents with rhythmic positive visual phenomena (flashing coloured lights) in his right visual field lasting 30 seconds. He remains fully conscious. EEG captures the event and shows rhythmic spikes over the left occipital region. What type of seizure is this?

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Correct answer: E — Focal aware seizure with visual symptoms — occipital lobe onset

Brief (<2 minutes) positive visual phenomena (flashing lights, coloured shapes) that are stereotyped and associated with rhythmic occipital epileptiform activity on EEG are characteristic of occipital lobe focal seizures. Key differences from migraine aura: seizure visual phenomena are briefer (<2 minutes vs 5–60 minutes), do not 'march', and may be coloured or formed. This patient has focal aware seizures (awareness preserved throughout). A: Migraine aura lasts 5–60 minutes and marches. C: TIA symptoms are maximal at onset. D: CBS occurs with visual field loss. E: Retinal detachment has flashes/floaters with visual field curtain.

Reference: NICE NG217; ILAE Seizure Classification; ICHD-3