Your brain can be divided into two halves: a left hemisphere and a right hemisphere. Each hemisphere can be further divided into different lobes: frontal lobe, parietal lobe, temporal lobe and occipital lobe. A hemispherectomy is a radical procedure in which a portion or all of the hemisphere is surgically removed to treat epilepsy and seizures.
This procedure is used for people who have epilepsy and seizures that do not benefit or see improvements from medications. This procedure is mainly used on children who have high adaptability as their brain is still growing. Although half of the brain is removed, young children are able to adapt to such changes and recover fully with minimal intellectual impairment. The remaining half of the brain is able to "take over" the functions of the other half.