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Ontology for the description of human clinical features
http://obophenotype.github.io/human-phenotype-ontology/
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Simple partial occipital seizures is not a synonym of visual auras #748

Closed pnrobinson closed 7 years ago

pnrobinson commented 8 years ago

Revise class HP:0011165 accordingly

pnrobinson commented 8 years ago

Translated comment of Ingo Helbig: visual auras are a particular manifestation of simple occipital seizures, which can have other manifestations. There are other types of vidsual aura, e.g., migrane related.

pnrobinson commented 8 years ago

The following excerpts are from http://brain.oxfordjournals.org/content/brain/126/4/753.full.pdf It is clear that Simple partial occipital seizures is not a synonym of visual auras. TODO -- revise.

Visual hallucinations are the hallmark of occipital seizures, but are not invariably present. Hallucinations typically commence in the visual field contralateral to the affected visual cortex and then spread to involve the entire visual field. Elementary visual seizures are characterized by fleeting visual manifestations which may be either positive (flashes, phosphenes) or, less commonly, negative (scotoma, hemi- anopia, amaurosis). Positive phenomena are usually flashes of colour or light, which are simple in shape and may be static or mobile. If the occipito-temporal cortex is involved, the visual hallucinations become complex and colourful, and scenes of varying complexity may be `seen'.

(...)

The major differential diagnosis is migraine. In occipital seizures, stereotyped visual hallucinations manifest as multiple bright coloured balls or circles which multiply, change in size, move horizontally, may flash, and last for seconds. In migraine, visual symptoms manifest as black and white, flickering, linear, zigzag patterns in the central field, gradually expanding and lasting for minutes

(...)

Other symptoms at onset of occipital seizures include sensations of ocular movement, tinnitus and vertigo; the latter two presumably represent spread to the posterior temporo- parietal region from a `silent' occipital focus (Dreifuss, 1985). Ictal vomiting, eye deviation and autonomic features are other clues of occipital seizures and are seen classically in the benign childhood seizure susceptibility syndrome de- scribed by Panayiotopoulos (1989). The external manifest- ations of occipital seizures may include clonic and/or tonic contraversion of the eyes and head or eyes only, forced closure of the eyelids and palpebral jerks