Some patients with MMD are found incidentally during physical examination or other tests and are asymptomatic; some patients with symptomatic MMD have typical symptoms including transient ischemic attack (TIA) (headache, seizures, weakness of limbs, sensory abnormalities and changes in vision and visual field, etc.), cerebral infarction (patients have varying degrees of motor or sensory impairment of limbs, visual field defects, aphasia, etc.), cerebral hemorrhage (headache, vomiting, consciousness (headache, vomiting, impaired consciousness, etc.) or a combination of multiple types.
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