Microvascular Decompression for Hemifacial Spasm
Fellowship-trained cranial neurosurgeons • 12 hospital affiliations across New JerseyMicrovascular decompression (MVD) for hemifacial spasm is a posterior fossa microsurgical procedure that relieves involuntary facial twitching by moving the blood vessel compressing the facial nerve away from the nerve and placing a small Teflon cushion between them to prevent future contact. It is the only treatment that addresses the underlying cause of hemifacial spasm and provides durable, long-term relief while preserving normal facial nerve function.
Key takeaways
- Hemifacial spasm is most commonly caused by a blood vessel compressing the facial nerve where it exits the brainstem.
- Microvascular decompression relieves this compression by separating the blood vessel from the facial nerve with a small Teflon cushion.
- MVD provides the highest rate of durable, long-term relief of any treatment for hemifacial spasm, with complete or near-complete relief in approximately 85% to 95% of appropriately selected patients.
- Unlike Botox injections, which temporarily weaken the facial muscles, MVD treats the underlying cause without intentionally weakening the facial nerve.
- Atlantic Brain and Spine's fellowship-trained cranial neurosurgeons determine whether microvascular decompression or another treatment offers the safest and most effective long-term relief.
| Condition treated | Hemifacial spasm involuntary twitching or contractions affecting one side of the face |
| Procedure type | Posterior fossa microvascular decompression of the facial nerve |
| Approach | Small retrosigmoid craniotomy behind the ear |
| Anesthesia | General anesthesia with facial nerve and brainstem auditory evoked potential (BAEP) monitoring |
| Surgery time | Approximately 2 to 3 hours |
| Hospital stay | Typically 2 to 3 nights |
| Long-term success | Approximately 85% to 95% of appropriately selected patients achieve complete or near-complete relief |
Timing and stay vary by patient and complexity. Your surgeon will confirm what to expect in your case.
What is hemifacial spasm?
Hemifacial spasm is a neurological disorder characterized by involuntary twitching or contractions of the muscles on one side of the face. The spasms are caused by abnormal activation of the facial nerve (cranial nerve VII) and typically begin around the eye before gradually spreading to involve the cheek, mouth, and neck.
In most patients, the underlying cause is a blood vessel most commonly the posterior inferior cerebellar artery (PICA) or anterior inferior cerebellar artery (AICA) compressing the facial nerve where it exits the brainstem. This constant pulsatile compression disrupts normal nerve signaling, leading to progressively worsening facial spasms.
Botulinum toxin (Botox) injections are often the first treatment because they temporarily reduce muscle contractions. However, the effects wear off after several months and require repeated treatments. Microvascular decompression is the only treatment that addresses the underlying cause by relieving the nerve compression.
How MVD for hemifacial spasm is performed
The operation is performed through a small retrosigmoid craniotomy behind the ear. Using microsurgical techniques, the surgeon identifies the facial nerve where it exits the brainstem and carefully mobilizes the compressing blood vessel away from the nerve. A small Teflon cushion is then placed between the vessel and the nerve to maintain permanent separation.
Throughout the procedure, specialized intraoperative monitoring including brainstem auditory evoked potentials (BAEPs) and facial nerve monitoring is used to help protect hearing and facial nerve function. Disappearance of the lateral spread response, an electrophysiologic marker monitored during surgery, helps confirm successful decompression.
Benefits and risks
Potential benefits
- Treats the underlying cause of hemifacial spasm rather than temporarily controlling symptoms
- Complete or near-complete long-term relief in approximately 85% to 95% of appropriately selected patients
- Preserves normal facial nerve function without intentionally weakening the facial muscles
- Most patients achieve durable relief after a single operation without requiring ongoing Botox injections
Possible risks
- Hearing changes related to the nearby hearing nerve, with risk minimized through intraoperative monitoring
- Temporary or permanent facial weakness from manipulation of the facial nerve (uncommon)
- Cerebrospinal fluid (CSF) leak, usually recognized and managed during the initial hospitalization
- Some patients experience gradual improvement over weeks to months as the facial nerve recovers after decompression
Your surgeon will review the benefits and risks specific to your diagnosis during your consultation.
What recovery looks like
Recovery from MVD for hemifacial spasm follows a similar course to MVD for trigeminal neuralgia:
- Days 1 to 3 Hospital stay of 2 to 3 nights. Many patients notice immediate improvement, while others experience gradual resolution over several weeks to months as the facial nerve recovers.
- Weeks 1 to 2 Return home. Headache and neck stiffness improve over 1 to 2 weeks. Light activity encouraged.
- Weeks 2 to 4 Return to desk work and light daily activity. Driving typically permitted at 2 to 4 weeks.
- 1 to 3 months Any residual spasm should continue to diminish. Full activity clearance. Long-term follow-up to confirm complete resolution.
Frequently asked questions
How long until the spasms stop after MVD?
Many patients notice immediate improvement or complete resolution when they awaken from surgery. Others experience gradual improvement over several weeks to months as the facial nerve recovers from longstanding compression. Mild residual spasms during the first few months do not necessarily indicate that the procedure was unsuccessful.
Is Botox a good alternative to MVD?
Botox is an effective treatment for symptom control but does not correct the underlying cause of hemifacial spasm. Most patients require repeat injections every 3 to 4 months because the effects are temporary. For appropriately selected patients, microvascular decompression offers the greatest likelihood of permanent, long-term relief without ongoing injections.
Can hemifacial spasm be caused by something other than a blood vessel?
Yes, although it is uncommon. Tumors, prior facial nerve injury, multiple sclerosis, and other neurological conditions can occasionally produce symptoms similar to hemifacial spasm. MRI is performed before surgery to confirm the diagnosis and identify the underlying cause.
What if I continue to have spasms after MVD?
Some patients continue to experience intermittent spasms for several weeks or months while the facial nerve recovers from chronic compression. If symptoms persist beyond the expected recovery period, your surgeon will evaluate whether additional imaging or treatment is needed. Complete resolution may take time even after a successful decompression.
This page is for general education and does not replace medical advice. Treatment decisions should be made with a qualified neurosurgeon based on your individual diagnosis and imaging. To discuss your options, call Atlantic Brain and Spine Brain Tumor Care at 973.993.7322 or request a consultation.
Facial Pain & Spasm Specialists at Atlantic Brain and Spine
Your care is provided by Atlantic Brain and Spine's multidisciplinary Facial Pain & Spasm Program, including fellowship-trained cranial neurosurgeons with expertise in microvascular decompression and other advanced treatments for hemifacial spasm.
