Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 13 Sept 2026Clinical review pending
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Cranial neuralgia with immediate danger
Facial or throat pain accompanied by syncope, bradycardia, airway compromise, acute brainstem signs, meningism, new deafness or a painful red eye is not a routine elective neurovascular-compression presentation.
Action: Stabilise airway and circulation, obtain urgent neurological and specialty assessment, and investigate stroke, infection, cardiac instability, ocular disease or mass before considering chronic neuralgia treatment.
Synopsis
Connect each episodic cranial-nerve syndrome to its characteristic clinical phenotype, interpret imaging contact without overdiagnosis, exclude secondary disease, and choose medical, ablative or decompressive treatment by nerve and patient.
A neurovascular-compression syndrome is a clinical cranial-nerve disorder with anatomically plausible pulsatile contact; a vessel touching a nerve on MRI is not the diagnosis.
Classical trigeminal neuralgia produces sudden unilateral electric-shock facial pain in a trigeminal division, often triggered by innocuous touch, chewing or speaking; objective sensory loss suggests secondary disease.
Hemifacial spasm affects facial-nerve motor muscles, glossopharyngeal neuralgia causes brief throat or ear-region pain and may provoke vagal symptoms, while vestibular paroxysmia remains a specialist diagnosis.
Key red flags
Objective facial sensory loss, corneal reflex change, bilateral symptoms, young onset or other neurological signs raises concern for multiple sclerosis, tumour or another secondary trigeminal neuropathy.
Glossopharyngeal pain with syncope or bradycardia can threaten circulation and requires urgent monitored specialist evaluation.
Sudden persistent hearing loss, vertigo with central signs or diplopia requires urgent stroke and otological assessment rather than a label of vestibular paroxysmia.
Continuous poorly localised facial pain, autonomic headache features or dental pathology should prompt diagnostic reconsideration before destructive nerve treatment.
Circulatory emergency
Neuralgic pain with syncope, bradyarrhythmia, airway compromise or persistent brainstem signs requires monitored urgent assessment.
Reasoning priorities
01
High-resolution MRI brain and cranial-nerve protocol
Exclude tumour, demyelination, infarction or other secondary disease and characterise the symptomatic nerve and adjacent vessels.
Contact alone is not diagnostic. Concordant proximal arterial compression with displacement or atrophy is more persuasive, while an asymptomatic or wrong-side contact is incidental.
Worked reasoning
Worked caseClassical trigeminal neuralgia with compression
Brief triggered unilateral electric-shock facial pain is specialist-confirmed and MRI excludes secondary disease while showing concordant neurovascular compression.
Confirm the pain phenotype and examination; obtain MRI because clinical features alone cannot exclude secondary disease and the scan informs procedure choice.
Begin or optimise disease-appropriate medication with counselling and monitoring, while discussing surgical options early rather than waiting for intolerable crisis.
If medicines fail or are poorly tolerated, compare MVD with neuroablative procedures and radiosurgery according to fitness, compression, desired durability and tolerance of numbness or craniotomy risk.
Provide a crisis and nutrition plan because severe attacks can prevent eating and drinking even though radiosurgery has delayed onset.
Key medicines
Carbamazepine for specialist-confirmed trigeminal neuralgiaUse the current product and formulary schedule, beginning with a low dose and titrating gradually to attack control or dose-limiting toxicity.Review interactions, blood count, liver function, sodium, rash and relevant HLA ancestry risk; do not transfer this indication to hemifacial spasm or every facial pain.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 13 Sept 2026; clinical approval remains outstanding.
Imaging of neurovascular compression syndromesAmerican Journal of Neuroradiology review published 2016; full body read 13 September 2026. Neurovascular compression principles; transition-zone anatomy; trigeminal neuralgia, hemifacial spasm and glossopharyngeal neuralgia imaging sections. Supports: Symptomatic contact is more persuasive near the vulnerable transition zone with nerve displacement or atrophy; ordinary contact is common and may be incidental. Limits: Imaging review, not a treatment guideline; radiology supports but does not replace syndrome diagnosis or multidisciplinary selection. Chapter-specific use: neurovascular-compression-syndromes.
MRI neurovascular compression study in hemifacial spasmBrain 2021; article body read 13 September 2026. Methods defining arterial contact location and severity; symptomatic versus asymptomatic side comparisons; discussion of proximal contact and deformity. Supports: Arterial compression at the proximal susceptible facial-nerve segment is associated with the symptomatic side; isolated contact requires clinical correlation. Limits: Observational imaging study in hemifacial spasm; cannot make MRI contact alone diagnostic or prove benefit from surgery. Chapter-specific use: neurovascular-compression-syndromes.
RCS England trigeminal neuralgia guidelinePublished August 2021; full PDF read 13 September 2026. Classification and diagnostic criteria; imaging; medicines; surgical referral, MVD, ablative procedures and radiosurgery; postoperative review. Supports: Classical, idiopathic and secondary trigeminal neuralgia separation; MRI to identify secondary cause and aid procedure choice; early surgical discussion and MVD preference in fit patients with neurovascular compression. Limits: UK professional multidisciplinary guideline for trigeminal neuralgia; does not govern hemifacial spasm or every cranial neuralgia. Chapter-specific use: neurovascular-compression-syndromes.
European Academy of Neurology trigeminal neuralgia guidelineEuropean Journal of Neurology 2019; full guideline PDF read 13 September 2026. Diagnostic classification; MRI and neurovascular contact interpretation; acute and long-term therapy; surgical treatment recommendations. Supports: MRI should be part of work-up because clinical features cannot exclude secondary disease; neurovascular contact should not confirm diagnosis; surgery is offered when medicines fail or are poorly tolerated. Limits: European professional guideline focused on trigeminal neuralgia, not facial spasm, vestibular symptoms or all incidental contacts. Chapter-specific use: neurovascular-compression-syndromes.