Microvascular decompression (MVD) is a surgical procedure that relieves pressure where a blood vessel is pressing against a nerve at the base of the brain. It is most commonly performed for trigeminal neuralgia, a condition that causes severe, shock-like facial pain. The surgery works by physically moving the offending blood vessel away from the nerve and placing a small cushion between them so they no longer touch.
Why the Surgery Is Needed
Certain blood vessels, usually small arteries, can shift position over time and come to rest against a cranial nerve where it exits the brainstem. This point of contact is called the root entry zone, and it’s particularly vulnerable to compression. The constant pulsing of the artery against the nerve damages its protective coating, causing the nerve to misfire. Depending on which nerve is affected, the result can be excruciating facial pain, involuntary muscle spasms, or other neurological symptoms.
The three most common conditions treated with MVD are:
- Trigeminal neuralgia: Intense, stabbing pain on one side of the face, often triggered by chewing, talking, or even a light breeze.
- Hemifacial spasm: Involuntary twitching or contraction of the muscles on one side of the face, typically starting around the eye.
- Glossopharyngeal neuralgia: Sharp pain in the throat, ear, or tongue triggered by swallowing or coughing.
MVD is generally reserved for patients whose symptoms haven’t responded well to medication. It’s the only treatment that addresses the root cause of the problem rather than masking symptoms or intentionally damaging the nerve.
How the Procedure Works
MVD is performed under general anesthesia with you lying on your side. The surgeon makes a small S-shaped incision behind the ear and creates an opening in the skull roughly the size of a dime. Through this opening, the surgeon works along the base of the brain to reach the affected nerve.
Once the nerve is exposed, the surgeon carefully identifies the blood vessel that’s pressing against it. The vessel is then gently lifted away from the nerve. To keep the two permanently separated, the surgeon places a small pad made of Teflon felt between them. In some cases, a sling technique is used: a strip of Teflon tape is looped around the artery and sutured to nearby tissue, physically holding the vessel in its new position. Surgical glue helps secure everything in place.
The opening in the skull is covered with a small plate, and the incision is closed using a piece of the patient’s own tissue to create a watertight seal. The entire procedure typically takes two to three hours.
Success Rates for Trigeminal Neuralgia
MVD has the strongest track record of any surgical treatment for trigeminal neuralgia. A landmark study published in the New England Journal of Medicine followed patients for a decade after surgery and found that 70% were completely pain-free without medication at the 10-year mark. Another 4% had only occasional pain that didn’t require daily treatment. After the first few years, the annual recurrence rate dropped below 1%, meaning the results tend to be durable once you’ve gotten past the early postoperative period.
In the shorter term, roughly 90% of patients experience significant pain relief (at least a 90% reduction) within the first year. Complete relief, meaning no pain and no medication at all, occurs in about 68% of patients at the 12-month mark.
Results for Hemifacial Spasm
MVD is equally effective for hemifacial spasm. A large meta-analysis pooling data from 39 studies and over 6,200 patients found an overall spasm-freedom rate of 90.5% at roughly one year of follow-up. Over 92% of patients experienced symptom resolution by six months, and 90% remained spasm-free at the one-year mark. First-time MVD patients did significantly better than those undergoing a repeat procedure, with more than four times the odds of achieving long-term spasm freedom compared to redo cases.
How MVD Compares to Less Invasive Options
For trigeminal neuralgia specifically, the main alternative to MVD is stereotactic radiosurgery (commonly known by the brand name Gamma Knife). This is a noninvasive approach that uses focused radiation to damage the trigeminal nerve and reduce pain signaling. It requires no incision, which makes it appealing to patients who want to avoid open surgery.
The tradeoff is effectiveness. In a study comparing the two approaches, 68% of MVD patients had complete pain relief at 18 months, while only 24% of radiosurgery patients maintained complete relief at that same point. At 12 months, 90% of MVD patients had at least 90% pain relief, compared to 75% of radiosurgery patients. The gap widened over time, suggesting radiosurgery’s effects fade more quickly. MVD is generally preferred for younger, healthier patients who can tolerate surgery, while radiosurgery is often offered to older patients or those with significant medical risks.
Risks and Complications
MVD involves working near the brainstem and several critical nerves, so the stakes are real even though the procedure is considered safe overall. The most well-studied complication is hearing loss, because the surgery takes place very close to the nerve responsible for hearing. A meta-analysis of over 11,000 trigeminal neuralgia patients found that hearing loss occurred in about 8% of cases overall, though the rate of permanent hearing loss was much lower, around 2.3%. Older patients face a somewhat higher risk: 3.9% versus 1.9% in younger patients.
Other possible complications include cerebrospinal fluid leak, temporary facial weakness, difficulty swallowing, and in rare cases, stroke affecting the brainstem or cerebellum. Serious complications are uncommon, but they underscore why this surgery is typically performed only after medications have failed.
Who Is a Good Candidate
Candidacy for MVD depends on both clinical symptoms and imaging findings. Before surgery, you’ll typically undergo specialized MRI sequences that produce highly detailed images of the nerves and blood vessels at the base of your brain. These scans can identify the specific vessel causing compression with a sensitivity of 75% to 93%.
Imaging alone doesn’t determine whether you’ll be offered surgery. A patient with classic symptoms and a clearly visible compressive vessel on MRI is an ideal candidate. Someone whose imaging doesn’t show an obvious culprit vessel can still be offered surgery, but with the understanding that the chance of success is lower. Conversely, even if imaging shows vascular compression, surgery won’t typically be offered if the clinical picture doesn’t fit, such as when symptoms are atypical or the patient has other health conditions that make brain surgery too risky.
What Recovery Looks Like
Most patients spend two to three days in the hospital after MVD. Headache and stiffness around the incision site are common in the first week and gradually improve. Many people feel well enough to return to light daily activities within two to three weeks, though full recovery, including a return to work and exercise, often takes four to six weeks. The incision behind the ear is small and typically hidden by hair once healed.
Pain relief from the surgery can be immediate, sometimes noticeable as soon as you wake up from anesthesia. For hemifacial spasm, some patients experience a delay: the twitching may take weeks or even months to fully resolve as the nerve heals from years of compression. Your surgeon will work with you on tapering off any medications you were taking before the procedure, which is usually done gradually over weeks to months rather than all at once.