What Is Microvascular Decompression?
Microvascular decompression, commonly referred to as MVD, is a neurosurgical procedure designed to relieve the nerve compression believed to cause classical trigeminal neuralgia. The operation targets the root of the trigeminal nerve where it exits the brainstem — the point where a blood vessel pressing against the nerve is thought to generate abnormal pain signals.
Unlike ablative procedures that destroy nerve tissue, MVD aims to preserve the nerve completely while eliminating the mechanical cause of the problem.
The Underlying Cause MVD Addresses
In most cases of classical trigeminal neuralgia, a blood vessel — most often the superior cerebellar artery — is in direct contact with the trigeminal nerve root. Over time, this pulsating contact is believed to wear away the protective myelin sheath around the nerve, causing it to fire abnormally and produce extreme pain signals.
MVD physically separates the offending vessel from the nerve, halting this abnormal signaling at its source.
How the Surgery Is Performed
- General anesthesia — The patient is fully asleep throughout the procedure.
- Positioning and incision — A small incision is made behind the ear on the affected side, and a coin-sized opening (craniotomy) is made in the skull.
- Navigation to the nerve — Using a surgical microscope, the neurosurgeon gently moves cerebellar tissue to access the trigeminal nerve root near the brainstem.
- Decompression — The offending blood vessel is carefully moved away from the nerve. A small pad of Teflon felt or similar material is placed between the vessel and the nerve to prevent re-contact.
- Closure — The craniotomy opening is closed, and the incision is sutured. The operation typically takes 2–3 hours.
Who Is a Candidate for MVD?
MVD tends to be recommended for patients who:
- Have classical (Type 1) trigeminal neuralgia confirmed by symptoms and imaging
- Show evidence of neurovascular compression on MRI
- Have not responded adequately to medication, or experience unacceptable medication side effects
- Are in reasonably good health to tolerate general anesthesia and open brain surgery
- Are younger patients for whom long-term pain relief is a priority
Older patients or those with significant medical comorbidities may be better suited to less invasive procedures.
What Results Can Be Expected?
MVD has the highest long-term success rate of any TN procedure. A significant proportion of patients experience complete pain relief immediately after surgery. While recurrence rates increase over the following years, many patients remain pain-free or substantially improved long-term. These figures come from published neurosurgical literature and should be discussed with your surgeon in the context of your individual case.
Risks and Possible Complications
As with any brain surgery, MVD carries risks that must be weighed carefully. Potential complications include:
- Facial numbness or tingling (in a minority of cases)
- Hearing loss on the surgical side (rare, due to proximity to the hearing nerve)
- Cerebrospinal fluid leak
- Infection or meningitis (uncommon)
- Stroke or bleeding — serious but rare
- Anesthesia-related risks
Complication rates are significantly lower when MVD is performed at high-volume centers by experienced neurosurgeons.
Recovery and Aftercare
Most patients stay in hospital for 3–5 days following MVD. The typical recovery timeline includes:
- First 1–2 weeks: Rest at home; some headache and neck stiffness are common
- 2–6 weeks: Gradual return to light activities; follow-up appointment with surgeon
- 6–12 weeks: Most patients return to normal daily activities and work
MVD Compared to Other Surgical Options
| Procedure | Invasiveness | Nerve Preservation | Long-Term Relief |
|---|---|---|---|
| MVD | Open craniotomy | Yes | Highest |
| Gamma Knife Radiosurgery | Non-invasive | Usually | Moderate |
| Percutaneous Rhizotomy | Minimally invasive | Partial damage intended | Moderate; numbness common |
The right choice depends on the patient's overall health, age, MRI findings, and personal preferences. A detailed discussion with a specialist in facial pain or neurosurgery is essential before deciding.