Do I Need a CT Scan for Sinusitis? What Sinus Imaging Shows

Patients with persistent sinus symptoms often ask whether they need a CT scan. The answer depends on the pattern, duration and severity of symptoms, what has already been tried, and what is found on nasal examination or nasendoscopy.

A CT scan is not usually needed for a simple cold or short episode of acute sinusitis. It can be very helpful, however, when symptoms are chronic, recurrent, one-sided, unusual or not responding to appropriate medical treatment.

At Hampshire ENT Clinics, Mr Tim Biggs and Mr Steve Hayes provide specialist rhinology assessment for nasal and sinus problems. They use clinical assessment, nasendoscopy and CT imaging where appropriate to provide a clear diagnosis and treatment plan.

Quick answer: when is sinus CT useful?

A CT scan is useful when chronic sinusitis is suspected, symptoms last more than 12 weeks, recurrent infections keep returning, nasal polyps are suspected, symptoms are one-sided, surgery is being considered, or previous treatment has not worked. It helps confirm the diagnosis and map the anatomy before sinus surgery.

What is a sinus CT scan?

A sinus CT scan is a detailed X-ray scan that shows the bones and air spaces of the nose and sinuses. It can show whether the sinuses are clear, inflamed, blocked or filled with mucus. It also shows the drainage pathways and anatomical variations that may be relevant to surgery.

The scan is quick and usually does not require dye or injections. It is different from an MRI scan, which is used in more selected situations such as soft tissue assessment or unusual findings.

What symptoms suggest chronic sinusitis?

Chronic sinusitis usually involves symptoms lasting more than 12 weeks. Key symptoms include nasal blockage, nasal discharge or post-nasal drip, facial pressure and reduced sense of smell. At least one of the main symptoms is usually nasal blockage or nasal discharge.

Facial pain alone, without nasal symptoms, is less likely to be sinusitis. This is important because many people with migraine or facial pain are told they have sinus problems when the CT scan is normal.

What can a sinus CT show?

A sinus CT can show mucosal thickening, blocked sinus drainage pathways, nasal polyps, retained mucus, one-sided disease, fungal-type changes, dental sinusitis, septal deviation, enlarged turbinates, concha bullosa and other anatomical variations.

For patients considering surgery, CT is essential for planning. It allows the surgeon to understand the anatomy of the eye socket, skull base, frontal sinus and drainage pathways before operating.

Can CT show why my nose is blocked?

Sometimes. CT may show a deviated septum, enlarged turbinates, polyps or sinus inflammation. However, nasal blockage is also assessed clinically because some causes are dynamic or mucosal and may be better seen during examination or nasendoscopy.

The best assessment often combines history, nasal examination, endoscopy and imaging rather than relying on one test alone.

When is CT not needed?

CT is usually not needed for a short cold, uncomplicated acute sinusitis that is improving, mild seasonal allergy or straightforward nasal symptoms that have not yet had appropriate medical treatment.

In many patients, treatment with saline rinses and intranasal steroid medication is tried first. If symptoms persist despite correct treatment, imaging may then be appropriate.

CT before sinus surgery

If functional endoscopic sinus surgery is being considered, CT is a core part of the planning process. It confirms which sinuses are affected and helps the surgeon plan a safe, precise and appropriately targeted operation.

At Hampshire ENT Clinics, advanced sinus surgery is delivered by experienced rhinology consultants. Mr Tim Biggs and Mr Steve Hayes both manage chronic and complex sinus disease and provide consultant-led care from diagnosis to aftercare.

Private sinus CT in Hampshire

For patients seeking rapid diagnosis, private ENT assessment can help streamline the process. In some cases, CT imaging can be arranged quickly, followed by review of the scan and a clear treatment plan.

This is particularly helpful for patients who have had repeated antibiotics, persistent symptoms, previous surgery, one-sided disease or uncertainty about whether symptoms are truly sinus-related.

Frequently asked questions

Does everyone with sinusitis need a CT scan?

No. Most short episodes of sinusitis do not need imaging. CT is more useful for chronic, recurrent, one-sided or treatment-resistant symptoms.

Can a CT scan diagnose chronic sinusitis?

It can support the diagnosis by showing inflammation or blockage, but results should be interpreted alongside symptoms and examination.

Can a CT scan be normal even if I have facial pain?

Yes. Facial pain can come from migraine, neuralgia, dental problems, jaw problems or mid-facial pain syndromes. A normal CT may help redirect treatment.

Is sinus CT painful?

No. It is a quick, non-invasive scan.

Do I need contrast dye?

Most routine sinus CT scans do not need contrast dye. Your consultant will advise if special imaging is needed.

Can CT show nasal polyps?

Yes. CT can show the extent of polyp disease and which sinuses are affected.

Can CT show a deviated septum?

Yes. CT can show septal deviation, although clinical examination is also important when assessing nasal obstruction.

Is CT needed before FESS?

Yes. CT is normally required before endoscopic sinus surgery to confirm disease pattern and plan surgery safely.

Can I have a private sinus CT through Hampshire ENT Clinics?

Patients can book consultant assessment, and imaging can be arranged where clinically appropriate.

Who reviews sinus CT scans at Hampshire ENT Clinics?

Mr Tim Biggs and Mr Steve Hayes review sinus imaging as part of specialist rhinology assessment.