Hemispherectomy is a very rare surgical procedure where one cerebral hemisphere (half of the brain) is removed or disabled. This procedure is used to treat a variety of seizure disorders where the source of the epilepsy is localized to a broad area of a single hemisphere of the brain, among other disorders. It is solely reserved for extreme cases in which the seizures have not responded to medications or other less invasive surgeries. Common reported complications of a hemispherectomy include: hydrocephalus, subdural fluid collections, CSF leakage, deep and superficial infections.