Introduction

Lissencephaly is a rare brain disorder that alters the way a foetus brain folds and develops during the pregnancy period. The word itself refers to “smooth brain,” and that is exactly what  a scan reveals lacking the normal grooves and peaks. This condition often leads to serious neurological issues, like mental disability, swallowing difficulties, muscle spasms, mobility issues, and one of the most challenging among them is seizures. Seizures are not just a symptom in lissencephaly, they are a main challenge for many families and children with this condition. These seizures can start in infancy and often develop resistance to common treatments. That is why choosing the right anti-seizure medication is essential for symptoms management and improving quality of life.¹

Understanding Lissencephaly and Seizures

Lissencephaly is caused by issues with brain cell migration during early stages of fetal development. This can happen because of genetic mutations, including those in the LIS1, DCX , ARX, TUBA1A genes or pregnancy related to certain infections. It can develop on its own (isolated lissencephaly) or as part of other syndromes such as Miller-Dieker syndrome and Walker-Warburg syndrome.¹

Types of lissencephaly

There are more than 20 different types of lissencephaly which are divided into two main categories:

• Classic lissencephaly (Type 1)^1,2
• Cobblestone lissencephaly (Type 2): this is associated with eye anomalies and muscular dystrophy^1,3 

Each category shares similar issues like the brain's unusually smooth structure with fewer grooves and folds but distinct genetic mutations.

Common neurological symptoms

Because the brain does not develop normally in babies, its electrical activity becomes irregular, which typically causes seizures. In fact, 90% of children with this condition develop epilepsy within the first year of life.¹

Types of seizures observed in lissencephaly

The seizures can be of different types:

1. Some babies may experience infantile spasms which are brief, sudden jerking movements that typically come in clusters
2. Others might be susceptible to generalized tonic-clonic seizures, which cause the body to stiffen and jerk
3. Focal seizures involve a single part of the brain
4. Myoclonic jerks include rapid, uncontrollably muscle twitches² 

Challenges in Seizure Management in Lissencephaly

Managing lissencephaly related seizures are often challenging because of the following reasons

• Drug resistance and refractory epilepsy

Refractory epilepsy is a disorder where the seizures are more resistant to typical treatment due to unusual brain structure & drug resistance protein.

• Developmental delays and co-morbidities complicate therapy

Besides that eating disorders, developmental delays and muscle tone problems, are common in children with this condition, and these all can have an impact on how well medications are absorbed and accepted.⁴

Parents and other caregivers frequently have to navigate a labyrinth of trial and error treatments, in an effort to find the correct medication or drugs combination that might offer some relief.

First-Line Anti-Seizure Medications (ASMs)

Regardless of the challenges, a number anti-seizure drug have proven promising results in managing seizures in lissencephaly:

•  Valproic Acid:

It is a broad-spectrum drug which is one of the most common medicines for a variety of seizure types like tonic-clonic, absence, and myoclonic seizures. Valproic acid  works by calming the overactive electrical signals in the brain by blocking voltage-gated sodium channel, augmentation of GABA concentrations, and mild inhibition of T-type calcium current.⁵ In studies of LIS1‑associated lissencephaly, valproate yielded good to partial seizure control in 88–100% of patients.⁶ However, this medication requires routine monitoring for possible adverse effects and liver function.

• Levetiracetam:

This broad-spectrum medicine can be used as adjuvant therapy for focal-onset seizures, myoclonic seizures in children (12 year or up) with juvenile myoclonic epilepsy and primary generalized tonic-clonic seizures in children with idiopathic generalized epilepsy.⁵
Although its exact mechanism is unknown, studies have linked its effectiveness to the binding of synaptic vesicle protein 2A (SV2A).

It is widely used for its favorable safety profile and ease of use. Leviteracetam does not interact much with other medications and is generally well tolerated, with common adverse effects like drowsiness, dizziness and upper respiratory infections, which is why it is valued for its favorable safety profile and low risk of drug interactions, though studies suggest it may be less effective than valproate or lamotrigine.⁶

•  Topiramate:

Another broad spectrum alternative that inhibits NMDA (N-methyl-D-aspartate) receptors, enhances GABA transmission and blocks voltage gated sodium channels.
It is preferred in both paediatric and adult medicine for focal-onset and primary generalized tonic-clonic seizures.
Topiramatemay help lessen the frequency of seizures, though it can sometimes cause side effects like fatigue, depression or kidney stones.⁵
Topiramate (or this medication) has lower response rates than valproate or lamotrigine.⁶

•  Clobazam:

It is a benzodiazepine which is often used as an add-on therapy. It has a calming effect on the brain’s electrical activity by binding GABA to the receptor and opening chloride channel which may help during seizure clusters.⁷

Treatment of Infantile Spasms in Lissencephaly

Infantile spasms are a specific type of seizure that often appears in babies with lissencephaly. Treating these early is important to protect brain development. Following are the treatment options which include:

• Valproic Acid:

Vigabatrin demonstrates efficacy in spasms associated with lissencephaly, an irreversible GABA‑transaminase inhibitor effectively used for infantile spasms. It must be used carefully due to the risk of vision issues.⁸ In LIS-related cases, it showed 62–83% partial or good responses.⁶

• ACTH (Adrenocorticotropic Hormone)

ACTH (Adrenocorticotropic Hormone) is a hormone therapy that can significantly reduce neuronal excitability in infantile spasms by two mechanisms:

• by inducing steroid release
• by a direct, steroid-independent action on melanocortin receptors⁹

However, it is expensive, injectable, and comes with potential side effects like fluid retention and high blood pressure.

• Prednisolone:

It is a steroid alternative to ACTH which primarily reduces inflammation on the brain and is sometimes used as a more affordable and accessible alternative to ACTH, although its effectiveness may be slightly lower.¹⁰

ACTH and prednisolone have shown comparable efficacy, with ACTH sometimes combined with Vigabatrin improving remission rates in symptomatic etiologies like lissencephaly.¹⁰

Alternative and Adjunctive Therapies

When seizures remain uncontrolled and medications alone do not work well enough,some other options may help:

Ketogenic Diet

The Ketogenic Diet has been recommended since 1921. It is a high fat, low carb medical diet, and has shown improvement in some children with hard-to-treat epilepsy. It changes how the brain uses energy by inducing ketosis. It is estimated that around 40-50% of individuals who begin the ketogenic diet experience a major decrease in seizure frequency within a year. Parents also report improvements in their child's behavior and attention.¹¹

Vagus Nerve Stimulation (VNS):

A surgery-based option for selected patients and is rarely recommended in lissencephaly due to the widespread nature of brain abnormalities. However, in highly selective cases, procedures like Vagus Nerve Stimulation (VNS) where a small device is implanted under the skin of the left upper chest that is connected to the left cervical vagus nerve, to send signals to the brain via software, may help reduce seizure severity.¹²

Monitoring and Individualized Treatment Plans

Every child with lissencephaly is unique, and so is their response to therapy. A customised treatment plan is therefore essential. Physicians may recommend following on regular basis

• EEG tests to examine brain activity
• Blood tests to monitor medication level and potential side effects
• Check-ins with specialists to track milestones and offer therapeutic support.

Families usually work with a healthcare specialist team which includes nutritionist, paediatric neurologists, geneticists and speech/motor therapists.¹ Changing dosages, switching prescriptions, and assessing overall progress is an ongoing process.

Summary

Lissencephaly is a rare but dangerous brain condition, occurring when the brain's regular folds and grooves are not formed in a foetus. This condition frequently leads to seizures that begin early in life. Families may find it challenging to manage these seizures because they do not always respond well to conventional therapies.

Fortunately, a number of anti-seizure drugs have had encouraging results in lowering the incidence of seizures. While Levetiracetam and Topiramate are well-tolerated and utilised based on the child's individual needs, Valproic Acid and Lamotrigine are frequently beneficial.

Treatments including Vigabatrin, ACTH and Prednisolone are available for infants with infantile spasms (a form of seizure that is common in lissencephaly), and they can be beneficial if started early.

In more resistant cases, supportive measures like ketogenic diet or vagus nerve stimulation may provide extra benefit. Managing seizures in lissencephaly isn't a one-size-fits-all approach because every child’s condition is different, so treatment strategies are customized and guided by a team of healthcare specialists, including neurologists, dietitians, and therapists.

With early intervention, consistent monitoring, and the right combination of therapies, families can feel more capable of handling this complicated condition & provide children a better quality of life.

FAQs

How common are seizures in children with lissencephaly, and are they easy to treat?

Seizures are very common, in fact 9 out of 10 of children with this condition develop epilepsy within the first year of life.¹ However, they are often difficult to manage, as many children don't respond well to standard treatments due to drug resistant leprosy. This makes ongoing, personalized care essential.

Can diet help with seizure control?

Yes, the ketogenic diet, a high-fat, low-carb diet has shown improvement in some children. Around 40-50% of individuals who begin the ketogenic diet experience a major decrease in seizure frequency within a year.¹¹

Will my child need to take these medications for life?

Many children with lissencephaly do require long-term medication. However, treatment may change over time based on how the child responds and grows. A follow-up checkup with a neurologist is important.

What specialists should be involved in my child’s care?

• Children with lissencephaly benefit from a healthcare specialist team approach, including:
• Paediatric neurologist
• Developmental therapist
• Genetic counselor
• Nutritionist
• Speech and motor therapists

Can seizures affect my child’s development?

Yes, uncontrolled seizures can interfere with brain development. That is why early and effective treatment is so important not just to reduce seizures, but also to help your child reach their full potential.