Sinus MRI Scan: Complete Guide

A sinus MRI scan uses magnetic resonance imaging to produce detailed pictures of the paranasal sinuses — the air-filled cavities around your nose, cheeks, and forehead. While CT is often the first-line imaging for sinus disease, MRI is superior for evaluating soft-tissue involvement, distinguishing between different types of sinus pathology, and assessing potential complications such as orbital or intracranial extension. This guide covers everything you need to know about sinus MRI scans in the UK.

What a Sinus MRI Scan Shows

Sinus MRI provides excellent soft-tissue contrast, enabling visualisation of:

• Chronic sinusitis — mucosal thickening, polyps, and retained secretions across all sinus groups (maxillary, ethmoid, frontal, sphenoid)
• Nasal polyps — their size, extent, and relationship to the sinus drainage pathways
• Sinonasal tumours — distinguishing benign growths (e.g. inverted papilloma) from malignancies (e.g. squamous cell carcinoma, adenocarcinoma)
• Fungal sinusitis — differentiating allergic fungal sinusitis from invasive fungal disease
• Orbital complications — spread of sinus infection to the eye socket
• Intracranial complications — extension through the skull base, including brain abscess or meningitis
• Mucocoeles — expansile cyst-like lesions within the sinuses
• Post-surgical assessment — evaluating recurrence after endoscopic sinus surgery

When You Might Need a Sinus MRI Scan

A sinus MRI may be recommended if you have:

• Chronic sinusitis symptoms not responding to medical treatment
• Persistent unilateral nasal obstruction or discharge (single-sided symptoms warrant investigation for tumours)
• Recurrent nosebleeds with no clear cause
• Facial pain or headaches localised around the sinuses
• Suspected sinus tumour on examination or CT
• Complications of sinusitis — swelling around the eye, severe headaches, or visual changes
• Pre-surgical planning for endoscopic sinus surgery or tumour resection
• Recurrent symptoms after previous sinus surgery

How to Prepare for a Sinus MRI

• No fasting required: Eat and drink normally before the scan
• Metal objects: Remove glasses, earrings, hearing aids, hairpins, and any facial piercings
• Dental work: Inform the team about metal crowns, dental implants, or braces, as these may affect image quality in the sinus region
• Clothing: Wear comfortable clothes without metal fastenings
• Contrast: Some sinus MRI protocols include gadolinium contrast — if so, a cannula will be placed in your arm
• Decongestants: You may be asked to avoid decongestant nasal sprays before the scan so the natural state of the sinuses can be assessed

What to Expect During the Scan

A sinus MRI typically takes 25–40 minutes:

1. Positioning: You'll lie on your back with your head in a head coil
2. Stillness: Keeping your head very still is particularly important for sinus imaging, as the structures are small and close together
3. Sequences: Multiple imaging sequences are acquired in different planes (axial, coronal, sagittal)
4. Contrast: If used, gadolinium is injected partway through the scan and additional sequences are acquired
5. Noise: Standard MRI sounds — earplugs or headphones are provided
6. Completion: You can leave immediately after the scan

Sinus MRI Scan Cost in the UK

A private sinus MRI in the UK typically costs between £350 and £700. CT of the sinuses is usually cheaper (£200–£400) but doesn't provide the same soft-tissue detail.

Lola Health offers sinus MRI scans through 150+ UK scanning centres with radiologist-reported results within 7–10 working days. View our sinus MRI scan for pricing and booking.

Sinus MRI and Blood Testing

Blood tests can help identify underlying causes of chronic sinus problems:

• Full blood count with differential — eosinophilia (raised eosinophils) may suggest allergic disease or eosinophilic granulomatosis
• CRP and ESR — elevated inflammatory markers in chronic sinusitis or vasculitis
• Total IgE and specific allergen panels — identifying allergic triggers for rhinosinusitis
• ANCA (anti-neutrophil cytoplasmic antibodies) — relevant if granulomatosis with polyangiitis (Wegener's) is suspected
• Immunoglobulin levels — IgA, IgG, IgM deficiency can predispose to recurrent sinus infections
• Aspergillus-specific IgE/IgG — if allergic fungal sinusitis is suspected

Start with a Lola Health blood test to check your CRP, IgE (allergy), and full blood count. If results suggest further investigation, a sinus MRI can provide the structural detail your blood results can't show. Peak Insights 70 covers these markers across 70 biomarkers.

Persistent or unusual sinus symptoms combined with abnormal blood markers may point towards an immune, allergic, or vasculitic cause that requires targeted treatment beyond standard sinusitis management.

Explore Lola Health blood tests to check your inflammatory and immune markers.

Considering a broader check? Read our full body MRI scan guide to see what a complete MRI screening covers, or explore the Peak 70 + Full Body MRI bundle for the most thorough health check available.

Frequently Asked Questions

Is sinus MRI better than sinus CT?

Each has strengths. CT is better for bony anatomy and is typically the first-line sinus imaging. MRI is superior for soft-tissue characterisation, distinguishing tumours from polyps, and assessing complications. They're often complementary.

Can a sinus MRI detect polyps?

Yes. MRI can clearly show nasal polyps and distinguish them from other soft-tissue masses such as tumours.

Is the scan painful?

No. Sinus MRI is completely painless. The only discomfort might be lying still and the scanner noise.

Can a sinus MRI detect cancer?

Yes. MRI is the imaging modality of choice for evaluating suspected sinonasal tumours, assessing their extent, and planning treatment.

Do I need a referral?

A referral isn't required for private sinus MRI through Lola Health. Clinical information helps the radiologist tailor the report.

How long does a sinus MRI take?

Typically 25–40 minutes, depending on the protocol used.

Book Your Sinus MRI Scan

If you're dealing with chronic sinus problems, persistent facial pain, or need further investigation of a sinus abnormality, a sinus MRI provides detailed answers.