Migraine headaches can sometimes, in some patients, accompanied by sensory phenomena grouped under the name “aura.” This is known as migraines with (approximately 20% of cases). These auras preceding the crisis and usually last less than an hour. Migraine pain follows him, sometimes after a delay of several minutes.
Auras are the most common auras eye: the visual field is filled with phenomena such scintillating points (Phosphenes), flies seem to cross the visual field (Floater) or broken lines of light, can form complex compositions. The visual aura may also include a lateral homonymous hemianopsia (loss of even half of the visual field of each eye), transient monocular blindness, etc.. Sensory auras may manifest as impaired sensitivity to types of paresthesias (tingling, itching) of a hemisomes topography often cheiro-oral (mouth and hand). Other auras are rare, and may pose diagnostic problems: transitory hemiplegia, diplopia with oculomotor palsy, psychic disturbances, auditory hallucinations, speech disorders. In all cases, the signs must decline rapidly and without sequelae. Neurological examination is always normal in migraine (outside of rare complications, see below). In some cases, the aura is not followed by headache.
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