~2% to 7% of benign childhood focal seizures.
Age at onset
3 to 15 years; mean ~8 years.
Males = females.
Neurological and mental state
Probably genetically determined.
Frequent visual seizures of mainly elementary visual hallucinations, blindness, or both. Ictal elementary visual hallucinations consist of small multicolored circular patterns that often appear in the periphery of a visual field. They develop fast in sec and last for several sec to 1 to 3 min. These may progress and co-exist with other occipital symptoms (sensory illusions of ocular movements and ocular pain, tonic deviation of the eyes, repetitive eye closures). Complex visual hallucinations, visual illusions, and other symptoms from anterior spreading may terminate with hemiconvulsions or generalized convulsions. Ictal blindness usually appears suddenly and usually lasts for 3 to 5 min.
Ictal headache, mainly orbital, occurs in 1/10 of patients.
Consciousness is usually intact. It becomes impaired with seizure progression.
Spreading to temporal lobe involvement is exceptional and may indicate a symptomatic cause.
Post-ictal headache, sometimes indistinguishable from migraine headache, occurs in half of patients.
Predominatly in alert stages.
All tests other than EEG are normal. High-resolution MRI is mandatory because symptomatic occipital epilepsies may have similar clinico-EEG manifestations.
Occipital paroxysms, often with fixation off sensitivity. Others may have only random occipital spikes, some may have occipital spikes in sleep EEG alone, and a few may consistently have normal EEG. Whether occipital photosensitivity is part of this syndrome or not is debated.
Occipital discharge of fast rhythms, fast spikes, or both.
Relatively good. Half of patients will remit within 2 to 4 years from onset. The others will continue having visual seizures and infrequent secondarily generalized tonic-clonic seizures, particularly if not appropriately treated with carbamazepine.
Migraine, symptomatic occipital epilepsy, and coeliac disease with visual seizures.
Drug treatment, mainly with carbamazepine, is probably mandatory.
*Expert opinion, please check FDA-approved indications and prescribing information
See also: http://professionals.epilepsy.com/page/syndromes_occipital.html
This page was adapted from:
The educational kit on epilepsies
The epileptic syndromes
By C. P. Panayiotopoulos
Originally published by MEDICINAE
Reviewed and revised June 2008 by Steven C. Schachter, MD
21 Cave Street, Oxford OX4 1BA
First published 2006 and reprinted in 2007