Synopsis
Confirm a trigeminal-neuralgia phenotype, identify secondary disease and neurovascular compression, and compare microvascular decompression, percutaneous neuroablative procedures and stereotactic radiosurgery through patient-specific trade-offs.
- Classical trigeminal neuralgia causes recurrent unilateral, brief electric-shock-like pain in one or more trigeminal divisions, triggered by innocuous stimuli; a continuous background component can coexist.
- MRI is used to exclude secondary disease and characterise neurovascular contact. Contact alone does not prove the diagnosis; morphological nerve change makes symptomatic compression more convincing.
- Carbamazepine or oxcarbazepine is first-line long-term treatment. Offer surgical discussion when pain is inadequately controlled or effective medicine is poorly tolerated; referral need not wait for years of escalating toxicity.
Key red flags
Objective facial sensory loss, corneal-reflex change, motor weakness, hearing change or other cranial-nerve signs suggest secondary trigeminal neuropathy or a structural lesion.
Bilateral symptoms, young age, long-lasting continuous pain without paroxysms or other neurological features raise multiple sclerosis, tumour and alternative diagnoses.
Visual loss, red painful eye, vesicular rash, fever, facial swelling, dental sepsis or temporal-artery symptoms follow their own urgent pathways.
Inability to drink or eat, marked weight loss, dehydration, hyponatraemia, marrow toxicity or severe drug reaction requires urgent medical care.
New numbness after an ablative procedure can be expected, but painful anaesthesia, corneal hypoesthesia, keratitis or new motor deficit needs urgent specialist review.
Severe depression or suicidal thoughts related to uncontrolled pain require immediate mental-health and safety intervention.
Sensory loss, bilateral pain, other cranial-nerve findings, young onset or demyelinating symptoms increase suspicion for multiple sclerosis, tumour or neuropathy.
Inadequate pain control, intolerable adverse effects or dangerous inability to eat/drink justifies specialist escalation and surgical discussion rather than endless dose escalation.
Expected numbness must be distinguished from painful anaesthesia, corneal hypoesthesia/keratitis and new motor or cranial-nerve deficit requiring urgent review.
Reasoning priorities
Exclude tumour, demyelination and other secondary causes and assess neurovascular compression for surgical planning.
Neurovascular contact alone is common and does not confirm TN. Morphological nerve change and clinical concordance strengthen its relevance to MVD.
Worked reasoning
A fit adult has typical unilateral triggerable electric-shock pain, medication intolerance and MRI showing concordant neurovascular compression with nerve distortion.
- Confirm the classical TN phenotype, exclude dental and secondary mimics, document facial/corneal function and review the high-resolution MRI with a specialist.
- Offer neurosurgical discussion because pain is not acceptably controlled or medicines are not tolerated; explain that imaging supports selection but does not make the diagnosis alone.
- Discuss MVD as first-line surgery for suitable classical TN because it addresses compression without intentional nerve injury and usually offers the most durable pain freedom.
- Compare craniotomy, anaesthetic, hearing, CSF-leak, cranial-nerve, stroke and rare mortality risks with percutaneous numbness/recurrence and radiosurgical delay/numbness.
- Choose through shared decision-making and maintain a plan for medicine taper, recurrence, sensory complications and follow-up after the selected procedure.