11546 Corpus Callosotomy

Overview

A corpus callosotomy (kor-pus ka-loh-SOT-uh-mee) is a type of brain surgery. It is used to help people whose seizures are very hard to control with medicine, most often children. The surgeon carefully cuts the corpus callosum — a thick bundle of nerve fibres that joins the left and right halves of the brain and lets them send messages to each other. Cutting it stops seizure signals from spreading back and forth between the two halves. The goal is usually not to cure epilepsy. The goal is to make seizures less severe, less frequent and safer — especially 'drop attacks', where a person suddenly goes limp and falls. This operation is sometimes called 'split-brain surgery'.

No, it is not common. Only a small number of people with epilepsy are ever considered for this surgery. It is usually done at a specialist epilepsy surgery centre.

It is done most often in children, often between about 2 and 15 years of age, and sometimes in adults. Many people who have it have frequent seizures of more than one type, learning difficulties or developmental delay, and seizures that have not improved after trying several medicines.

Symptoms

Common symptoms

• Drop attacks — sudden loss of muscle tone that makes the person fall, sometimes many times a day, often with head or face injuries
• More than one type of seizure, such as stiffening seizures, staring spells or jerking seizures
• Seizures that carry on despite trying two or more epilepsy medicines at the right dose
• Seizures that start in one part of the brain and spread quickly to both sides
• Injuries from falls, such as cuts, bruises, dental damage or head injuries
• Tiredness, confusion or behaviour changes after frequent seizures

Symptoms in children

• Frequent falls that lead to bumps, bruises, broken teeth or stitches
• Loss of skills or slower development than expected, which can happen when seizures are very frequent
• Staring spells, head drops or nodding that other people may not recognise as seizures
• Behaviour that is more irritable or withdrawn around times of frequent seizures
• Needing extra help or supervision at school and at home because of seizure risk

Symptoms in older adults

• Drop attacks with falls, which carry a higher risk of broken bones in older people
• Confusion or memory problems that get worse when seizures are poorly controlled
• Seizures that begin in one part of the brain and then spread to the whole brain
• Bruising or injuries that are not explained, or falls that are blamed on 'clumsiness'

Causes

Main causes

• The surgery is not caused by anything — it is a treatment. The seizures it is used for have many possible causes.
• Brain development problems (malformations) present from birth
• Brain damage around the time of birth, such as a lack of oxygen
• Genetic conditions that cause epilepsy, including some epilepsy syndromes that begin in childhood
• Past brain infections such as meningitis or encephalitis
• Head injury, strokes or tumours of the brain
• Metabolic conditions (problems with how the body handles certain chemicals or energy)
• In many people, no specific cause is ever found

Risk factors

• Seizures starting very early in childhood
• Having several different seizure types at once
• Drop attacks, especially with injuries
• Learning difficulties or developmental delay alongside epilepsy
• Seizures that have not responded to several epilepsy medicines

When to see a doctor

See a doctor urgently if:

• Seizures are becoming more frequent or more severe
• Someone has been injured during a seizure
• You are worried about breathing during or after a seizure
• After surgery: fever, a headache that keeps getting worse, fluid or redness at the wound, new weakness, or unusual sleepiness and confusion

Book a routine appointment if:

• You want to talk about whether epilepsy surgery could be an option
• Seizures are not fully controlled and you have not seen a specialist epilepsy team
• Side effects of epilepsy medicine are affecting daily life
• You need advice about safety at home, at school or at work
• You have questions about recovery, school, driving or work after surgery

Diagnosis

A corpus callosotomy is not something you are 'diagnosed' with — it is a treatment that a specialist epilepsy team may recommend. The team first needs to be sure of two things: that the seizures are the kind this operation can help, and that other options have been properly tried. They do this through a detailed history of the seizures (often with videos from family), a full examination, and a series of tests. The decision is made together by a neurologist, a brain surgeon, a specialist nurse, a psychologist and often other team members.

Tests that may be done

• A detailed seizure diary and descriptions or videos of the seizures from family or carers
• EEG (electroencephalogram) — painless sticky pads on the scalp that record the brain's electrical activity
• Video-EEG monitoring — staying in hospital for a few days so seizures can be recorded on video and on EEG at the same time
• MRI scan of the brain — detailed pictures that can show a cause for the seizures
• Neuropsychological assessment — friendly tests of memory, attention, language and learning, done before and sometimes after surgery
• Blood tests and, where relevant, genetic testing
• Sometimes extra scans or tests to show which side of the brain controls speech and movement

What to expect at your appointment

The assessment usually happens over several visits and may include a short hospital stay. It can take weeks or months. Nothing happens without your agreement, and you can ask questions at every stage. The team will explain what they found, what they think surgery could achieve for this particular person, and what the alternatives are.

Treatment

A corpus callosotomy is one option among several for severe, hard-to-treat epilepsy. It is usually considered when drop attacks are frequent and dangerous, and when medicines have not worked. The operation is done under general anaesthetic (the person is asleep and feels nothing). The surgeon makes a small opening in the skull and cuts part or all of the corpus callosum. Sometimes only the front part is cut first, and the rest later if needed. Most people go home within about a week, but full recovery takes longer.

Self-care at home

• Keep a seizure diary — what happened, when, how long it lasted, and what the person was doing
• Follow the epilepsy team's safety advice: supervise bathing and swimming, use helmets or protective headgear if advised, and think about soft flooring or stair gates at home
• Make sure everyone at home, school or work knows what to do during a seizure and when to call for emergency help
• Get plenty of sleep — tiredness is a common seizure trigger
• Take any prescribed epilepsy medicine exactly as directed, and never stop it suddenly without talking to the team
• Attend follow-up appointments and rehabilitation appointments, even when things feel fine
• Ask the team before returning to sport, swimming, cycling or driving

Medical treatments

Medicines to prevent seizures are the main treatment for epilepsy and will usually have been tried first, often several different ones, before surgery is considered. These are chosen and adjusted by a specialist, and the aim is the lowest dose that works with the fewest side effects. Other options that a specialist team may discuss instead of, or alongside, surgery include special diets (such as a carefully supervised ketogenic diet), implanted devices that stimulate nerves to reduce seizures, and treating any underlying cause that can be treated. No single option suits everyone, and the best choice depends on the seizure type, age, health and personal preferences.

When is surgery considered?

Surgery may be offered when seizures — especially drop attacks — are frequent, cause injuries, or seriously affect daily life, and when at least two or three appropriate epilepsy medicines have not worked. It may also be considered when seizures are having a clear effect on learning or development. It is not usually offered when seizures are well controlled, when the risks are judged too high, or when tests suggest another treatment would work better. The final decision is always made together with the specialist team and the person or their family.

Living with this condition

Most people notice the biggest difference in the first few months: falls and drop attacks often become much less frequent, and injuries go down. Seizures may not disappear completely, and other seizure types may stay the same, so safety plans still matter. In the first days and weeks after surgery, there may be swelling and tiredness, and some people have temporary weakness in one leg or arm; this usually improves with time and physiotherapy. Some people have mild 'split-brain' effects — for example, one hand doing something the other hand undoes, or brief trouble finding words — which are often most noticeable at first and settle or become easier to manage.

Lifestyle tips

• Build rest into the day and keep a steady sleep routine
• Follow the epilepsy team's advice about school, work, driving and sports
• Keep a seizure diary so changes are easy to spot at appointments
• Ask about a seizure alert device, padded headgear or home safety changes if falls are still a risk
• Keep in touch with the specialist epilepsy nurse — they are often the quickest route to advice
• Encourage the person to stay involved in decisions about their own care, at a level that suits their age and understanding

Diet and exercise

There is no special diet needed after a corpus callosotomy unless the team recommends one, such as a supervised ketogenic diet for seizures. Eating a balanced diet, drinking enough water and staying active at a level that feels safe all help recovery and mood. Gentle walking, swimming with supervision and physiotherapy exercises are often encouraged. Avoid contact sports, cycling on roads or swimming alone until the team says it is safe.

Mental health and emotional wellbeing

Living with hard-to-treat epilepsy — and deciding on brain surgery — is emotionally heavy for the person and for those caring for them. It is normal to feel anxious, exhausted, sad or relieved, sometimes all in the same week. Children may worry about being different from friends, and parents often carry a lot of stress. Talk to the epilepsy team about how you are feeling; psychological and counselling support is part of good epilepsy care. If you or someone you care for has thoughts of harming themselves or is in crisis, contact your local emergency number or a crisis support service right away — you deserve immediate help, and it is available.

Prevention

The need for this surgery cannot usually be prevented, because it depends on the type of epilepsy a person has, not on anything they or their family did wrong. What can be helped is getting the right care early: if seizures are not controlled after a fair trial of two or three medicines, ask for a referral to a specialist epilepsy team. Good seizure first aid, home safety and treating injuries and infections promptly also reduce harm.

Vaccines

There is no vaccine for epilepsy or for the need for this surgery. However, keeping up with routine childhood vaccinations, following your local immunisation schedule, helps prevent some brain infections (such as meningitis) that can cause epilepsy. Ask your doctor or pharmacist which vaccines are recommended for you or your child.

Screening programmes

There is no screening test for this surgery. If epilepsy runs in the family, or a child has a known genetic or brain condition, a genetic or neurology clinic can offer advice. Regular epilepsy reviews are the best way to make sure treatment stays right over time.

Complications

If left untreated

• Drop attacks continuing, with repeated falls and injuries such as head knocks, cuts, broken bones or dental damage
• Frequent seizures disrupting school, work, sleep and family life
• Slower learning or development in children when seizures are very frequent
• More emergency department visits and hospital stays
• Rarely, serious complications of seizures themselves; a specialist team will talk through these risks with you honestly
• Surgery also carries its own risks, including infection, bleeding, swelling, temporary weakness, changes in speech or memory, fluid build-up in the brain, and the chance that seizures do not improve as hoped

Long-term outlook

For many people, a corpus callosotomy makes a real difference. Drop attacks often become much less frequent or stop, injuries go down, and daily life becomes calmer and safer. Some people become free of drop attacks, and a small number become free of seizures altogether. Others still have some seizures, but they are often shorter, milder or easier to manage, and some people can reduce their epilepsy medicine. Benefits usually appear within weeks to a few months. Recovery has good days and harder days — your epilepsy team will stay with you throughout, and it is always fair to ask what to expect for your own situation.

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