Magnetic resonance imaging of the paranasal sinuses is a non-invasive imaging exam that allows highly accurate assessment of the nasal sinus cavities, adjacent structures and soft tissues of the face. It is especially useful in the characterization of inflammation, tumors, polyps or complications related to chronic sinusitis.
What is MRI of the Paranasal Sinuses?
MRI of the paranasal sinuses is an exam that uses magnetic fields and radiofrequency waves to obtain detailed images of the paranasal sinuses (maxillary, ethmoidal, frontal and sphenoidal), nasal cavities and surrounding structures. Unlike CT, which is more often used to assess bone, MRI is preferred when the goal is to study soft tissues, tumoral lesions, deep infections or possible extension to intracranial or orbital structures.
What is the price of MRI of the Paranasal Sinuses?
The price of MRI of the paranasal sinuses is €275 when performed on a private basis. However, it can also be performed through several agreements, including:
- ADSE: If MRI of the paranasal sinuses is performed through ADSE, the patient only pays a fee of €30;
- IASFA, ADM GNR, SAD PSP;
- Insurance Companies: Médis, Multicare, Advance Care, Allianz, Saúde Prime, Future HealthCare, SS CGD, SAMS Quadros, SAMS, Montepio, RNA, Generali, Mudum, MGEN, Aegon, Vitória, Una Seguros, and other insurers.
- Health Plans: Medicare, Saúde Prime, Future HealthCare, Continente Wells, ACP, and other health plans.
- Protocols: NRD has protocols with several clinics and institutions that allow you to undergo the exam at very competitive prices. In the case of MRI of the paranasal sinuses, the protocol price is €220.
The price varies depending on the healthcare system or insurance you use.
Learn more about the price of MRI
How is it performed?
The patient is positioned lying down, with the head inside the appropriate coil. Images are acquired in different planes with high resolution. In some clinical situations, intravenous contrast (gadolinium) may be required, especially when there is suspicion of a tumor, complications or invasive infections.
The MRI scanner is open at both ends.
Earplugs are provided to reduce perception of the equipment noise.
The exam lasts around 30 to 40 minutes and does not cause pain. It is essential to remain still to ensure image quality.
What does it detect?
MRI of the paranasal sinuses allows the detection of:
- Complicated acute or chronic sinusitis;
- Nasal or sinus polyps;
- Benign and malignant tumors of the nasal cavity or sinuses;
- Invasive fungal infections;
- Orbital or intracranial complications of infections;
- Congenital malformations of the nasal cavities;
- Postoperative changes;
- Among others.
When is it indicated?
MRI of the paranasal sinuses is indicated for:
- Study of chronic sinusitis refractory to treatment;
- Assessment of nasal masses or polyps;
- Diagnosis of aggressive infections (e.g., mucormycosis);
- Suspected tumoral extension to the orbit or brain;
- Surgical planning in rhinology;
- Analysis of changes after nasal or sinus surgery;
- Among others.
Preparation and guidelines for MRI of the Paranasal Sinuses
Before undergoing MRI at NRD, please consider the following factors:
| Topic | Guideline |
| Exam Prescription (paper form) | You must bring the Exam Prescription in paper format. |
| Fasting | Most MRI exams do not require fasting. For exams with contrast, fasting for 3 hours is usually necessary (confirmed upon scheduling). |
| Early arrival | Arrive 15 minutes before the scheduled time. |
| Medication | You may take essential medication with a minimal amount of water. |
| Metal objects | Remove all metal objects (e.g., earrings, bracelets, necklaces, piercings, hairpins, removable prostheses, etc.). |
| Pregnancy | Inform the NRD healthcare professional if you are pregnant. |
| Previous exams / Tests / Info | Bring previous exams, relevant clinical information and recent laboratory tests. |
| Glucose monitoring implant | Do not place the implant, as it will need to be removed before the exam. |
| Makeup | Do not wear makeup, as some products may interfere with the exam. |
| Valve and/or orthopedic prostheses | If you have valve and/or orthopedic prostheses, bring documentation describing their material and composition. |
| Hearing aids | Inform the clinic if you use a hearing aid, as it must be removed before the exam. |
| Dental prostheses | Inform the clinic if you use a dental prosthesis, as it must be removed before the exam. Also inform them if you have dental implants. |
| Orthodontic appliances | Inform the clinic if you have orthodontic appliances. A test may be required to assess compatibility with MRI. |
| Pacemakers and implantable devices | NRD does not perform MRI on people with pacemakers or implantable devices (e.g., cochlear implants). The exam should be performed in a hospital setting. |
Throughout the MRI exam, you will be continuously monitored by the NRD imaging technician responsible for your exam. An alert system will also be available for you to activate if needed.
You must remain still during the exam to ensure image quality.
The entire NRD team will be available to answer any questions you may have.
After the exam, you may resume your normal routine.
When and how do you receive the results?
You will receive the MRI results within 7 days after the exam, by email or in paper format at the clinic. On the day of the exam, you will take home a CD with the images.
Where to do it?
MRI can be performed at NRD, at the following address:
Avenida Columbano Bordalo Pinheiro, nº 11-B, ground floor, 1070 – 060 Lisbon (Next to Praça de Espanha)