In the diagnosis of trigeminal neuralgia, precise neuroimaging (MRI) and electrophysiological studies are of key importance.
Each method has its strengths and limitations, but MRI is today's gold standard in the search for the cause of pain.
MRI allows us not only to see whether the trigeminal nerve is being compressed by a blood vessel but also to assess morphological changes and select the appropriate treatment method.
A 3T scanner provides a more detailed image than 1.5T, although in practice, 1.5T is often sufficient.
Specialized MRI sequences (including 3D-SSFP, CISS, TOF, PC) are used to visualize arterial and venous vessels and to identify possible neurovascular conflict.
Modern techniques such as DTI (diffusion tensor imaging) reveal structural differences in the nerve between healthy individuals and patients, and can even help predict the effectiveness of neurosurgical treatment.
Electrophysiological Studies
These are performed when MRI is not possible or does not confirm the suspected cause of pain.
They include:
- trigeminal reflex testing,
- evoked potential studies.
The sensitivity of reflex testing reaches 94%, with specificity of 87%, making it particularly useful for detecting secondary trigeminal neuralgia.
Differential Diagnosis — What Must Be Excluded
Not every facial pain is trigeminal neuralgia.
That is why it is so important to distinguish classical and idiopathic neuralgia from its secondary forms (those with a specific cause).
The most common conditions that can mimic neuralgia:
- Cerebellopontine angle tumors — usually benign, but compressing the nerve and causing local demyelination.
- Multiple sclerosis (MS) — MS patients have up to a 20-fold greater risk of developing neuralgia.
- Trigeminal nerve injuries — e.g., after dental procedures, accidents, or surgery.
- Connective tissue diseases — in rare cases, neuralgia may be their first manifestation.
In MS, the pain mechanism may be dual, resulting from nerve demyelination and/or vascular compression. This is precisely why treatment is often difficult, and patients frequently require high medication doses.
Other pains that can resemble trigeminal neuralgia:
- Persistent idiopathic facial pain — dull, long-lasting, often daily pain without an identifiable cause.
- Glossopharyngeal neuralgia — paroxysmal, piercing pain in the throat, tongue, or ear, worsening with swallowing, coughing, or sneezing.
- Certain paroxysmal headaches — e.g., migraine, cluster headache, SUNCT, SUNA, hemicrania continua.
It is precisely the similarity of symptoms (paroxysmal pain, unilaterality, location) that often leads to diagnostic errors.
In practice, some patients show overlapping symptoms of trigeminal neuralgia and SUNCT syndrome. Some researchers believe these may not be two different conditions but rather different manifestations of the same pain disorder.
Natalia — since 2014 I've been living with trigeminal nerve pain. I write in plain language, based on reliable sources and personal experience. Read my story →
Frequently Asked Questions
What is trigeminal neuralgia?
Trigeminal neuralgia is a chronic facial pain condition. It manifests as sudden, severe, usually one-sided pain attacks — often described as an electric shock. A single attack typically lasts from a few seconds to about two minutes.
What is neurovascular conflict (vascular compression)?
This is the most common cause of classical trigeminal neuralgia — a blood vessel compresses the nerve root at the base of the brain, damaging its myelin sheath and triggering pain.
Why is an MRI performed?
MRI helps detect neurovascular conflict and rule out other causes of pain, such as tumors or multiple sclerosis. The diagnosis of neuralgia itself is primarily clinical.
Which doctor should I see for facial pain?
First, see a neurologist. If surgery is being considered, a neurosurgeon. If a dental cause is suspected, it is also worth ruling it out with a dentist.
Can trigeminal neuralgia be cured?
In many people, pain can be effectively controlled with medications or procedures, and MVD provides the most durable results in eligible patients. The course varies — with periods of remission and relapse. Decisions are made together with your doctor.
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