We have reported a 38-year-old female who did not show clinical seizures during continuous spikes in the left occipital area over a period of 18 years. As to the neurological findings, visual disturbance, optic nerve atrophy and right hemianopsia were almost always present. The low density area distributing from the left occipital area to the left temporal one on the CT revealed to be porencephaly. From the clinical findings obtained in this case, the lesion responsible for the occipital continuous spikes could be ascribed to be functional abnormality of the visual pathway connecting the left lateral geniculate body with the left occipital cortex.
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