Weber's syndrome is a neurological condition caused by an injury to the midbrain, the uppermost section of the brainstem. It's usually caused by a stroke (infarction), but in rare cases, Weber’s syndrome can also be caused by a brain tumor, a traumatic injury, or infection.
The midbrain is already one of the smallest regions of the brain, and Weber's syndrome affects functions controlled by a small section of this region—eye movement being one. Even though this area of the brain is quite small, people with Weber’s syndrome can experience several major neurological problems.
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