Dystonia causes an imbalance in opposing muscle forces: Muscles contract involuntarily, twisting the body into abnormal, painful postures. Medications and Botox help, but when they aren't enough, neurosurgery may offer relief.
A movement disorder in which muscles contract when they shouldn't, and don't fully relax when they should.
Normally, moving a body part smoothly depends on pairs of opposing muscles taking turns: one contracts while its opposite relaxes. In dystonia, that coordination breaks down, and opposing muscles co-contract at the same time, pulling the affected body part into a twisted, sustained, or repetitive posture that the person cannot simply choose to stop. It can affect the neck, eyelids, jaw, voice box, an arm or hand, a leg, or the whole body, and it often worsens with stress, fatigue, or trying to perform a specific task, while easing during sleep.
Most patients start with medications and, for focal forms, botulinum toxin (Botox) injections, which are effective first-line treatments (see below). Neurosurgery is considered when those options no longer provide enough relief, need to be given at doses or frequencies that become impractical, or can't reasonably reach a widespread, generalized pattern of dystonia. Two neurosurgical options are generally available: deep brain stimulation of the globus pallidus internus (GPi), and MRI-guided laser pallidotomy, a targeted lesion in the same structure.
Dystonia looks different depending on which muscles are involved. Select a type below to see its hallmark signs, typical age of onset, and whether a "sensory trick" is commonly seen.
Click on a body part in the figure, or choose a region from this list:
Select a type on the left, or a region on the figure, to explore how dystonia affects it.
Treatment isn't one-size-fits-all: it intensifies in steps, matched to how well symptoms respond at each stage. Most patients are treated successfully, at least for a time, with medication and, for focal dystonia, botulinum toxin, and move to a more intensive option only when the current one is no longer enough.
Anticholinergic drugs such as trihexyphenidyl, muscle relaxants such as baclofen, and sometimes a trial of levodopa (to check for a rare, highly treatable form called dopa-responsive dystonia) are the starting point, especially for generalized or childhood-onset dystonia. Benefit is often modest, and higher doses can cause sedation, dry mouth, or memory and concentration problems, which limits how far this option can be pushed, particularly in adults.
For focal dystonia, such as cervical dystonia or blepharospasm, Botox injections are the established first-line treatment. The toxin blocks the nerve signal that tells a muscle to contract, weakening just the targeted muscles for about three to four months, after which the injection is repeated. Roughly seven in ten patients get meaningful relief this way, often for years at a time.
When symptoms remain intractable at the medication and Botox stage, meaning they stop providing enough relief, need doses or injection intervals that become impractical, or can't realistically reach a generalized pattern involving many muscle groups at once, deep brain stimulation or pallidotomy become the next, more intensive step. This is the focus of the rest of this page.
One practical note: because Botox targets specific injected muscles, it works best for focal and segmental dystonia. Botox is less effective when dystonia is generalized across the body. Neurosurgical therapies such as DBS and pallidotomy are often more effective in these situations because they act centrally on the brain circuit driving the abnormal contractions rather than on individual muscles.
Several factors inform whether, and when, DBS or pallidotomy make sense. Click any factor below to understand how it fits into that conversation.
Select a category above, then click any factor to see how it informs candidacy.
Both target the same brain structure, the globus pallidus internus, but work in fundamentally different ways. Toggle below to compare.
| Feature | Deep Brain Stimulation (GPi) | Pallidotomy (MRI-Guided Laser) |
|---|---|---|
| Mechanism | Chronic electrical stimulation via an implanted electrode | Permanent thermal lesion in a small volume of the GPi |
| Hardware | Implanted electrode, extension wire, and battery/pulse generator | None left behind: no permanent implant |
| Reversibility | Reversible: can be turned off or removed | Permanent: the lesion cannot be undone |
| Adjustability | Fully adjustable: programmed and re-tuned over time | Fixed: effect is set at the time of treatment |
| Bilateral treatment | Both sides in one or two staged procedures, with an established safety record | Historically higher risk of speech/swallowing complications when done bilaterally; often approached more cautiously or staged |
| Effect onset | Gradual: often weeks to months after activation and programming | Can begin within days to weeks, sometimes faster than DBS |
| Long-term maintenance | Battery checks/replacement, periodic programming visits | None: no device to maintain |
| MRI after procedure | Conditional: depends on device model and settings | Unrestricted |
Because DBS is adjustable and reversible, most patients who are candidates for brain surgery today are recommended DBS first. Pallidotomy remains a reasonable, effective alternative for patients who cannot be closely followed for programming, prefer not to have permanent hardware, or have other individual reasons to prefer a one-time procedure. Your neurosurgeon and movement disorders neurologist will help you weigh these factors together.
DBS for Dystonia typically targets the Globus Pallidus Internus (GPi). Nevertheless, we can perform DBS surgery in different ways depending on a patient's preference and circumstances. Each method has its own advantages and disadvantages, but all enable safe and precise placement of the DBS electrode into the proper target.
Select each step to learn what happens and why.
Neurosurgical procedures take place in the operating room and sometimes in a procedural MRI scanner. Either way, you show up to the pre-op admitting area and get checked in by nursing, the anesthesia team, and the surgical team. Operations for DBS or pallidotomy typically last about 4-6 hours.
Using the surgical plan and pre-op MRI/CT, thin probes (electrodes or fiber optics) are guided into the GPi on one or both sides of the brain. In DBS surgery, microelectrode recordings and test stimulation may be conducted to fine-tune lead position. Placement of the pulse generator battery is typically the following week in a brief procedure under general anesthesia. In laser pallidotomy, the key part of the procedure takes place while you are asleep in an MRI scanner. After the ablation, the fiber optics are removed. In both cases patients are typically observed one night after the main procedure.
An incisionless, investigational approach uses ultrasound energy to create lesions that disrupt abnormal, hyperactive circuits underlying dystonia.
MRI-guided focused ultrasound (FUS) uses focused sound waves to create a small lesion without any incision. It is FDA-approved for essential tremor and Parkinson's disease, and small pilot studies have now begun testing it for dystonia, most often targeting the ventro-oralis thalamus for focal hand dystonia (such as writer's or musician's cramp), with meaningful improvement reported at 12 months in the patients studied.
A newer, related target has also emerged: pallidothalamic tractotomy, which lesions the pathway connecting the pallidum to the thalamus rather than the pallidum itself. A 2025 pilot study of this thalamic target in ten patients with cervical dystonia reported significant improvement in neck symptoms at six months, an encouraging first signal for a form of dystonia that hadn't previously been studied with FUS.
This evidence is still early: the studies are small, uncontrolled, and short-term. Side effects, including reduced hand dexterity and speech changes in some patients, have been reported. FUS for dystonia is not yet an established alternative to DBS or pallidotomy, and it is not currently a standard offering. Individual patients in special circumstances may be considered candidates for this procedure, though FDA approval and insurance coverage are lacking because of its early, experimental status.
Evidence-based outcomes from clinical studies and long-term follow-up. Individual results vary with dystonia subtype, cause, and disease duration.
Both procedures carry the standard risks of any intracranial procedure, including bleeding and infection, each in the range of one to a few percent. With DBS, hardware-related issues, such as infection, lead migration, or device malfunction, can usually be addressed by adjustment, revision, or removal, since nothing about the brain tissue itself is permanently altered. With pallidotomy, because the lesion is permanent, side effects such as speech difficulty, swallowing difficulty, or weakness, while uncommon, cannot be reversed if they occur; this risk is higher when both sides are treated than when one side is treated. Your surgical team will review your individual risk profile in detail before any procedure.
Dystonia patients are cared for by the Comprehensive Movement Disorders Center, a multidisciplinary team of neurosurgeons, movement disorders neurologists, and neuropsychologists working together.
See the full Comprehensive Movement Disorders Center team on the Brown Neurosurgery website.