MRI Scan for Dizziness and Vertigo

Dizziness and vertigo affect roughly 1 in 4 people in the UK at some point. Most cases are caused by inner ear problems that MRI cannot see — but MRI plays a critical role in ruling out serious central nervous system causes such as acoustic neuromas, brainstem lesions, stroke, and multiple sclerosis. If your dizziness is unexplained, prolonged, or accompanied by hearing loss, tinnitus, or neurological symptoms, a brain MRI is the essential investigation to make sure nothing structural is behind it.

Understanding the difference between dizziness (lightheadedness, unsteadiness) and vertigo (a spinning sensation) is important because they have different causes and different investigations. MRI is most valuable when vertigo has features suggesting a central (brain) origin rather than a peripheral (inner ear) origin.

Dizziness vs Vertigo — What's the Difference?

• Vertigo — a false sensation that you or the room is spinning, tilting, or moving. Caused by problems in the vestibular system (inner ear or brainstem). Often accompanied by nausea, vomiting, and balance difficulty.
• Presyncope/lightheadedness — a feeling of nearly fainting. Usually cardiovascular in origin (low blood pressure, arrhythmia, dehydration).
• Disequilibrium — a sense of imbalance or unsteadiness, particularly when walking. Can be caused by neurological, musculoskeletal, or vestibular problems.
• Non-specific dizziness — vague dizziness often related to anxiety, hyperventilation, or medication side effects.

Common Causes of Vertigo

Peripheral Causes (Inner Ear) — MRI Usually Normal

• Benign paroxysmal positional vertigo (BPPV) — the most common cause of vertigo, affecting around 2.4% of the population at some point. Caused by tiny calcium crystals (otoconia) becoming displaced in the semicircular canals. Symptoms: brief intense spinning (less than 60 seconds) triggered by specific head movements (rolling over in bed, looking up, bending forward). Diagnosed by the Dix-Hallpike test, not MRI. Treated with the Epley manoeuvre (a simple repositioning technique) — success rate over 90%.
• Vestibular neuritis/labyrinthitis — inflammation of the vestibular nerve or inner ear, usually following a viral infection. Causes sudden, severe, continuous vertigo lasting days to weeks. MRI is usually normal but may show enhancement of the vestibular nerve on contrast-enhanced images.
• Meniere's disease — affects approximately 1 in 1,000 people. Causes recurrent episodes of vertigo (lasting 20 minutes to hours), fluctuating hearing loss, tinnitus, and a feeling of fullness in the ear. Caused by excess fluid (endolymph) in the inner ear. Standard MRI is usually normal, though specialised MRI protocols with intratympanic gadolinium can visualise endolymphatic hydrops (the excess fluid).
• Vestibular migraine — vertigo as a migraine symptom, with or without headache. Increasingly recognised as a very common cause of recurrent vertigo, particularly in women. MRI is typically normal or shows non-specific white matter changes.

Central Causes (Brain) — MRI Is Essential

• Acoustic neuroma (vestibular schwannoma) — a benign tumour on the vestibular nerve. Affects about 1 in 100,000 people per year. Causes gradual one-sided hearing loss, tinnitus, and sometimes imbalance (rarely true spinning vertigo). MRI with contrast is the diagnostic test — it shows the tumour in the internal auditory canal and cerebellopontine angle. Around 1,200 are diagnosed annually in the UK.
• Brainstem or cerebellar stroke/TIA — posterior circulation stroke can present with vertigo, often with other symptoms (double vision, difficulty swallowing, facial numbness, limb incoordination). MRI with DWI detects acute stroke.
• Multiple sclerosis — demyelinating plaques in the brainstem or cerebellum can cause vertigo. Often with other neurological symptoms. See our MS MRI guide.
• Chiari malformation — downward herniation of the cerebellar tonsils through the base of the skull. Can cause vertigo, headache (worse with coughing/straining), and balance problems.
• Cerebellar tumours — can cause progressive imbalance and vertigo.
• Cerebellopontine angle lesions — masses in this area (meningiomas, epidermoids, arachnoid cysts) can compress the vestibular nerve.

When to Get an MRI for Dizziness

MRI is recommended when vertigo has features suggesting a central cause:

• One-sided hearing loss — particularly gradual, progressive hearing loss in one ear. The most important red flag for acoustic neuroma.
• Unilateral tinnitus — tinnitus in one ear only.
• Neurological symptoms — double vision, facial numbness or weakness, difficulty swallowing, limb weakness or numbness, severe incoordination.
• Vertigo that does not fit a peripheral pattern — continuous vertigo without hearing symptoms, vertigo with direction-changing nystagmus, vertigo with severe headache.
• Progressive symptoms — gradually worsening balance, hearing, or neurological function over weeks to months.
• First presentation of vertigo after age 50 — higher risk of vascular causes.
• No response to treatment for BPPV or other peripheral causes — if the Epley manoeuvre does not work for presumed BPPV, the diagnosis may be wrong.

What the MRI Shows

A brain MRI for dizziness assessment should include:

• Standard brain sequences — T1, T2, FLAIR, DWI. Assess for stroke, MS lesions, tumours, Chiari malformation.
• Internal auditory canal (IAC) protocol — thin-section, high-resolution T2-weighted images and post-contrast T1-weighted images through the internal auditory canals and cerebellopontine angles. This is essential for detecting acoustic neuromas — even very small ones (a few mm).
• CISS/FIESTA sequence — a heavily T2-weighted 3D sequence that shows the nerves within the internal auditory canal surrounded by bright CSF. Excellent for detecting small tumours and neurovascular compression.

Total scan time: 25-40 minutes.

What MRI Cannot Show

• Inner ear fluid problems — standard MRI does not detect Meniere's disease or endolymphatic hydrops. Specialised MRI protocols (with intratympanic or intravenous gadolinium) can show hydrops but are only available at specialist centres.
• BPPV — the displaced otoconia (calcium crystals) in BPPV are too small for MRI to detect. BPPV is diagnosed clinically (Dix-Hallpike test).
• Vestibular function — MRI shows structure, not function. Vestibular function testing (videonystagmography, caloric testing, rotary chair testing) measures how well the vestibular system is working.
• Cardiovascular causes of dizziness — lightheadedness from low blood pressure, arrhythmias, or dehydration is not detected on brain MRI. ECG, Holter monitor, and tilt table testing are needed.

When NOT to Get an MRI

• Classic BPPV — if the Dix-Hallpike test is positive and the Epley manoeuvre resolves your symptoms, MRI is not needed.
• Clear peripheral vestibular neuritis — if you have had a single episode of acute vertigo following a viral illness, with no hearing loss or neurological symptoms, and you are recovering, MRI may not add useful information (though it is often done to exclude central causes).
• Presyncope/lightheadedness — if your dizziness is clearly related to standing up (orthostatic hypotension), dehydration, or anxiety, cardiovascular and psychological assessment is more appropriate than brain MRI.

Alternative Diagnostic Approaches

• Vestibular function testing — videonystagmography (VNG), caloric testing, video head impulse test (vHIT). Measures vestibular nerve and inner ear function. Done by audiologists or specialist vestibular physiotherapists.
• Audiometry (hearing test) — essential if hearing loss is a symptom. Asymmetric sensorineural hearing loss is a key indicator for MRI to rule out acoustic neuroma. If hearing is normal and symmetric, acoustic neuroma is very unlikely.
• CT scan — better than MRI for assessing the bony structures of the inner ear (temporal bone CT). Used when MRI is contraindicated or when bony pathology (cholesteatoma, superior semicircular canal dehiscence) is suspected.
• Blood tests — thyroid function, glucose, full blood count (anaemia), vitamin B12, iron studies. Metabolic causes of dizziness are common and treatable.
• Cardiovascular assessment — ECG, lying and standing blood pressure, Holter monitor, echocardiogram. For presyncope and lightheadedness.

Treatment Pathways

• BPPV — Epley manoeuvre (performed by a physiotherapist, GP, or ENT specialist). Success rate over 90% in 1-3 treatments. Brandt-Daroff exercises for home use.
• Vestibular neuritis — vestibular rehabilitation exercises (the single most effective treatment), short-term vestibular sedatives (prochlorperazine, cyclizine), and corticosteroids in the acute phase.
• Meniere's disease — low-salt diet, betahistine, diuretics. Intratympanic steroid or gentamicin injections for refractory cases. Rarely, surgery (endolymphatic sac decompression or labyrinthectomy).
• Vestibular migraine — migraine preventers (propranolol, topiramate, amitriptyline), trigger avoidance, lifestyle modification.
• Acoustic neuroma — observation with serial MRI for small tumours (watch and wait). Stereotactic radiosurgery (Gamma Knife) for growing tumours. Surgical removal for larger tumours. Treatment decision depends on size, growth rate, hearing level, and patient preference.
• Central causes — treatment of the underlying condition (stroke management, MS treatment, Chiari decompression surgery).

UK Statistics

• Dizziness affects approximately 25% of adults at some point
• BPPV accounts for roughly 20-30% of all vertigo diagnoses
• Acoustic neuromas are diagnosed in approximately 1 in 100,000 people per year (around 1,200 per year in the UK)
• Meniere's disease affects about 1 in 1,000 people
• Vestibular migraine is increasingly recognised as the second most common cause of vertigo after BPPV
• Less than 5% of vertigo cases have a central (brain) cause

Frequently Asked Questions

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