Watch: the CureRays® explainer series
Prefer to read? The full guide below is complete on its own, with tables you can revisit any time.
What is nasal cavity & paranasal sinus cancer?
Nasal cavity and paranasal sinus cancer is a rare cancer that develops in the nasal cavity (the hollow space behind the nose) or in the paranasal sinuses (the air-filled pockets in the bones around the nose and eyes). Because these spaces are roomy, tumors can grow for a while before causing symptoms, which often resemble ordinary sinus problems: persistent nasal stuffiness or blockage on one side, nosebleeds, a reduced sense of smell, facial pain or pressure, a lump or numbness on the face, watery eyes, or changes in vision if the tumor presses near the eye. Several different cell types can occur here, including squamous cell carcinoma (the most common), adenocarcinoma, and rarer tumors such as esthesioneuroblastoma (which arises from smell-related nerve tissue). Risk factors include long-term exposure to certain industrial dusts and chemicals, such as wood or leather dust. These cancers sit close to critical structures — the eyes, the brain, and major nerves — so treatment is carefully planned by a multidisciplinary team and frequently combines surgery with highly precise radiation designed to control the cancer while protecting these delicate neighbors.
The main types
Doctors group nasal cavity & paranasal sinus cancer by where it starts and how it behaves:
| Type | What it means, simply |
|---|---|
| Squamous cell carcinoma | The most common type, arising from the lining of the nasal cavity and sinuses. |
| Adenocarcinoma | A cancer arising from glandular cells, sometimes linked to long-term wood or leather dust exposure. |
| Esthesioneuroblastoma (olfactory neuroblastoma) | A rare tumor that starts in the smell-nerve tissue high in the nasal cavity; it is treated with surgery and radiation and often has good outcomes. |
| Adenoid cystic carcinoma and other rare types | Salivary-type and other uncommon tumors that can occur here; some tend to track along nerves, which radiation planning takes into account. |
Staging, in plain terms
Nasal and sinus cancers are staged with the TNM system, with separate criteria for tumors of the maxillary sinus (the cheek sinus) and for those of the nasal cavity and ethmoid sinuses (between the eyes). T describes how large the tumor is and which surrounding structures it has reached, such as the eye socket, the bones of the face, or the base of the skull near the brain. N describes spread to lymph nodes, which is less common here than in some other head and neck cancers. M describes spread to distant organs. These combine into stages I through IV. Because the tumor's proximity to the eye and brain strongly affects treatment, the T category is especially important in planning surgery and radiation.
| TNM (tumor, nodes, metastasis), stages I–IV | What it generally means |
|---|---|
| Stage I | A tumor confined to one area of the nasal cavity or a single sinus, without spread — often treated with surgery, radiation, or both. |
| Stage II | A tumor that has grown into a neighboring part of the same region but has not reached the eye socket, facial bones, or other distant structures. |
| Stage III | A larger tumor that involves nearby bone or has spread to a single lymph node; usually treated with combined surgery and radiation, sometimes with chemotherapy. |
| Stage IV | A tumor that has grown into critical structures such as the eye, brain, or skull base, spread to multiple lymph nodes, or reached distant organs; treated with combined therapy tailored to the situation. |
The standard of care
Nasal Cavity & Paranasal Sinus Cancer is almost always treated by a team that may include a surgeon, a medical oncologist, and a radiation oncologist, combining therapies for the best result. The usual building blocks are:
Surgery
Removing the tumor — increasingly through the nostrils with endoscopic techniques, or through open surgery for larger tumors — is a mainstay, with reconstruction to restore form and function.
Radiation therapy
Radiation is often given after surgery to destroy remaining cells, or as the main treatment when surgery is not suitable; precise targeting protects the eyes and brain.
Chemotherapy
Chemotherapy may be added for advanced or aggressive tumors, given with radiation or to shrink a tumor before other treatment.
Skull-base team approach
Because these tumors sit near the eye, brain, and major nerves, surgeons, radiation oncologists, and other specialists plan treatment together to remove or control the cancer while protecting vision and brain function.
Rehabilitation and supportive care
Specialists help with breathing, smell, facial appearance, and any effects on the eye, supporting recovery and quality of life.
How radiation treatment works
Radiation uses focused high-energy beams to damage the DNA inside cancer cells so they can no longer grow and divide. For nasal and sinus cancers, radiation is a key treatment — often given after surgery to clean up any remaining cancer cells, or as the main therapy when surgery is not possible. The central challenge is that these tumors sit right next to the eyes, optic nerves, and brain, so the radiation must be both effective against the cancer and gentle to those vital structures. Modern techniques meet this challenge: IMRT shapes the dose to the intricate anatomy of the region, and proton therapy stops precisely at the target with almost no dose beyond it, which is especially helpful for tumors near the eye or skull base. Treatment is given as a series of short daily sessions over several weeks and is painless during delivery. Side effects can include nasal dryness or crusting, fatigue, skin changes, and effects on taste or the eye, all of which are monitored and managed by the team. Your radiation oncologist will design a plan aimed at controlling the cancer while protecting your vision and brain function.
The main ways radiation is delivered for nasal cavity & paranasal sinus cancer:
Intensity-modulated radiation therapy (IMRT)
IMRT sculpts the radiation dose to the complex shape of the nasal and sinus region, concentrating it on the tumor while sharply limiting dose to the eyes, optic nerves, and brain.
Proton therapy
Proton beams stop precisely at the target and deliver little dose beyond it, making them especially valuable for tumors wrapped around the eye or against the skull base, helping preserve vision and protect the brain.
Stereotactic radiosurgery
Highly focused radiation can treat a small, well-defined tumor or boost a specific area with pinpoint accuracy and steep dose fall-off around critical structures.
Latest studies shaping care
Care keeps improving — often toward getting the same excellent results with less burden on patients. A few developments:
Proton therapy to protect the eyes and brain: For sinonasal tumors near the eye and skull base, proton therapy delivers high doses to the cancer while sparing the optic nerves and brain, and is associated with good control and fewer vision-threatening side effects.[1]
Sinonasal proton therapy outcome series
Endoscopic surgery plus radiation: Removing many of these tumors through the nostrils with endoscopes, followed by targeted radiation, achieves good control with less facial disruption than traditional open surgery for suitable cases.[2]
Endoscopic skull-base surgery studies
Better outcomes for esthesioneuroblastoma: Combining surgery with radiation has produced favorable long-term survival for esthesioneuroblastoma, a distinctive nasal tumor, with treatment tailored to its grade and extent.[3]
Olfactory neuroblastoma treatment reviews
Common questions
Will treatment affect my vision? Protecting the eyes is a top priority because these tumors sit so close to them. Modern radiation techniques such as IMRT and proton therapy are specifically designed to deliver the dose to the cancer while sparing the eyes and optic nerves. Your team will discuss any risk to vision and how they plan to minimize it; in some advanced cases involving the eye, more extensive treatment may be needed, which they will explain fully.
Why do I need radiation if the tumor was removed by surgery? Radiation after surgery targets any microscopic cancer cells that may remain, especially in this region where tumors sit near critical structures and may extend in ways that are hard to fully remove. Adding radiation lowers the chance the cancer will come back.
Are these cancers curable? Many are, particularly when found before they involve the eye or brain and when treated with the combination of surgery and precise radiation. Outcomes depend on the cell type, the stage, and the exact location, and your multidisciplinary team will give you a clear picture for your specific situation.
References
Numbered sources for the studies cited above. Links open the primary publication on PubMed or the publisher’s site.