Nasal Squamous Cell Carcinoma in Cats: Signs, Treatment and Prognosis

Nasal Squamous Cell Carcinoma in Cats: Signs, Treatment and Prognosis

By Dr Duncan Houston

A recurring scab on a cat’s nose can look minor. It may be mistaken for a scratch, sunburn or skin infection, particularly when the cat is otherwise eating and behaving normally.

However, a crusted lesion that repeatedly heals and returns can be an early sign of squamous cell carcinoma. Detecting it while it remains small and superficial can make an enormous difference to the treatment options and long-term outcome.

It is also important to distinguish cancer on the external surface of the nose from cancer growing inside the nasal cavity. Both may be called nasal squamous cell carcinoma, but they are not the same clinical problem.

Quick Answer

Squamous cell carcinoma on the external nasal planum usually begins as persistent redness, scaling, crusting, pigment loss or a small ulcer. It is strongly associated with ultraviolet exposure, particularly in cats with white fur or lightly pigmented noses.

Squamous cell carcinoma inside the nasal cavity more often causes persistent one-sided nasal discharge, nosebleeds, sneezing, noisy breathing or facial swelling. A biopsy is required to confirm either form. Early external lesions can sometimes be controlled for years, while internal nasal tumours usually require radiation therapy and have a more guarded prognosis.

First, Which Type of Nasal SCC Does Your Cat Have?

The word “nasal” can refer to two separate locations.

Feature	Nasal planum SCC	Intranasal SCC
Location	External hairless surface of the nose	Inside the nasal cavity or sinuses
Type of cancer	Cutaneous squamous cell carcinoma	Respiratory or mucosal carcinoma
Typical early sign	Crust, scale, redness or ulcer on the nose	Persistent discharge from one nostril
Relationship with sunlight	Strongly associated with chronic ultraviolet exposure	No proven relationship with sunlight
Main diagnostic test	Skin biopsy	Head CT followed by nasal biopsy
Typical treatment	Surgery, superficial radiation, external-beam radiation, electrochemotherapy or another local treatment	Radiation therapy, with other treatment selected according to biopsy results
Main threat	Progressive local destruction of the nose and surrounding tissue	Nasal obstruction, bone invasion and extension into nearby structures

A tumour can occasionally extend from the external nasal planum into the nostril or nasal cavity, so the distinction is not always perfectly neat. CT imaging becomes particularly important when an external lesion is thick, distorts a nostril or extends onto the upper lip or face.

What Is Squamous Cell Carcinoma?

Squamous cells form part of the skin and the lining of several body cavities. Squamous cell carcinoma, usually shortened to SCC, develops when these cells become malignant and grow uncontrollably into nearby tissue.

SCC is usually more aggressive locally than it is metastatic. This means the immediate problem is often destruction of the tissue where the cancer began rather than rapid spread throughout the body.

An external nasal planum tumour may progressively destroy the nose, nostrils and upper lip. An internal tumour may invade the nasal turbinates, surrounding bones, sinuses, orbit or tissues beneath the brain.

Metastasis to regional lymph nodes or the lungs can still occur, particularly with larger or more advanced tumours, so staging may be recommended before major treatment.

What Does Nasal Planum SCC Look Like?

The nasal planum is the hairless surface at the end of a cat’s nose.

Early sun-related damage may look surprisingly insignificant. Owners may notice:

• Loss or change of normal nose pigment

• Mild redness

• Dry, flaky or rough skin

• A thin crust

• A small scab that repeatedly returns

• A shallow ulcer

• Occasional spotting of blood

• One nostril looking slightly different from the other

As the lesion progresses, it may become:

• Thickened

• Raised

• Firm

• Irregular

• Deeply ulcerated

• Moist or infected

• Painful

• Easily bleeding

• Destructive to the nostril

• Extended onto the upper lip or surrounding facial skin

Cutaneous SCC can progress through a spectrum from actinic damage and dysplasia to carcinoma in situ and then invasive cancer. Earlier lesions are usually easier to treat than thick, deeply invasive tumours.

Can a tiny scab really be cancer?

Yes.

The mistake owners understandably make is waiting for the lesion to become a noticeable lump. Early nasal planum SCC often looks more like a persistent scratch or crust than a conventional tumour.

A lesion becomes more suspicious when it:

• Lasts longer than approximately two weeks

• Returns repeatedly in the same location

• Bleeds after minor contact

• Slowly becomes wider or deeper

• Fails to respond as expected to appropriate treatment

• Occurs on a pale or sun-exposed nose

• Is accompanied by similar lesions on the ear tips or eyelids

A recurring lesion deserves investigation even when the cat appears completely comfortable.

What Are the Signs of SCC Inside the Nasal Cavity?

Intranasal tumours are hidden from view, so the signs are usually related to obstruction, inflammation, bleeding or invasion of nearby structures.

Possible signs include:

• Persistent discharge from one nostril

• Bloody nasal discharge

• Recurrent nosebleeds

• Frequent sneezing

• Snorting or noisy nasal breathing

• Reduced airflow through one nostril

• Pawing or rubbing at the nose

• Loss of normal smell

• Reduced appetite

• Weight loss

• Facial swelling or asymmetry

• Swelling beneath or beside an eye

• Excessive tearing

• A protruding or displaced eye

• Difficulty opening the mouth

• Open-mouth breathing in advanced cases

Late neurological signs may occur if a tumour extends through the bones separating the nasal cavity from the brain. These may include seizures, marked behavioural change, circling, reduced awareness or severe disorientation.

In a clinicopathological study of 123 feline nasal and paranasal sinus tumours, nasal discharge was the most common presenting sign. Difficulty breathing, facial swelling and nosebleeds were also frequently reported. SCC and adenocarcinoma were among the most common epithelial tumours, while lymphoma was the most common tumour overall.

Does nasal discharge need to be bloody?

No.

Discharge may be:

• Clear

• Watery

• Mucous-like

• Thick and yellow

• Blood-streaked

• Predominantly bloody

A persistent one-sided discharge is more concerning for a localised problem than occasional discharge from both nostrils during a short respiratory infection.

The timing matters. A cat with a few days of sneezing and bilateral discharge may have an upper respiratory infection. A senior cat with several weeks of worsening unilateral discharge, bleeding or reduced airflow needs imaging and a more complete investigation.

How Worried Should You Be?

Risk level	What you may notice	What to do
Suspicious but stable	Small recurring scab, crust or pigment change on the external nose, with normal appetite and breathing	Arrange a veterinary examination within the next few days
Needs prompt investigation	Persistent ulcer, occasional bleeding, one-sided nasal discharge or sneezing lasting longer than one to two weeks	Arrange an examination and diagnostic plan within 24 to 72 hours
High concern	Visible mass, nostril distortion, facial swelling, frequent nosebleeds, reduced airflow, weight loss or difficulty eating	Seek same-day or next-day veterinary assessment
Critical	Open-mouth breathing, severe respiratory distress, uncontrolled bleeding, blue or grey gums, collapse, seizures or reduced consciousness	Go to an emergency veterinary hospital immediately

A small external lesion is unlikely to cause a breathing emergency today, but delaying investigation may allow a highly treatable superficial cancer to become a far more invasive one.

What Causes Nasal Planum SCC?

Chronic ultraviolet exposure is the strongest recognised risk factor for cutaneous SCC on the feline nasal planum.

A classic epidemiological study found that white cats had a substantially higher risk of cutaneous SCC than non-white cats. More than half of the SCC cases in that study involved the ears or nose, which are sparsely haired and receive substantial ultraviolet exposure.

Risk is increased by:

• White or lightly coloured fur

• A pink or poorly pigmented nasal planum

• Sparse hair around the nose

• Regular outdoor sun exposure

• Sleeping for prolonged periods in direct sunlight

• Living in a high-ultraviolet environment

• Older age

• Previous actinic or sun-related skin damage

Pigmented cats can still develop nasal planum SCC. A dark nose reduces ultraviolet exposure to vulnerable cells but does not provide complete protection from all forms of cancer.

Does one sunburn cause SCC?

Usually not.

The risk is more closely related to repeated ultraviolet injury accumulated over years. The earliest visible changes may remain subtle for months or even years before invasive cancer develops.

This is why an older white cat with a recurring nose scab should not simply receive repeated creams while the lesion slowly becomes deeper.

What Causes SCC Inside the Nasal Cavity?

The cause of intranasal SCC is usually unknown.

Unlike cutaneous SCC on the nose tip, an internal nasal tumour is not considered a typical sunlight-induced cancer. Ultraviolet light does not reach the deeper respiratory lining where these tumours originate.

Age is an important general risk factor for feline nasal neoplasia, but there is no single proven food, household product, infection or lifestyle factor that reliably explains most cases.

This means that keeping a cat indoors may reduce the risk of ultraviolet-related nasal planum SCC but cannot guarantee prevention of a tumour developing inside the nasal cavity.

How Is External Nasal Planum SCC Diagnosed?

1. Physical Examination

The veterinarian should assess:

• The size of the lesion

• Whether it is superficial or thickened

• Whether one or both nostrils are affected

• Extension onto the upper lip or bridge of the nose

• The ear tips and eyelids for other actinic lesions

• Regional lymph nodes

• The mouth and teeth

• Airflow through each nostril

• The cat’s body weight and general health

Photographs with a ruler or measurement scale are useful for documenting progression.

2. Biopsy

A biopsy is required to determine whether the lesion represents:

• Actinic dysplasia

• Carcinoma in situ

• Invasive SCC

• Another form of cancer

• Inflammatory or infectious disease

A punch, wedge or incisional biopsy may be collected under sedation or general anaesthesia. The sample should include the active edge and an appropriate depth of tissue rather than only loose crust or dead surface material.

Cytology may occasionally identify malignant squamous cells, but histopathology provides more reliable information about invasion and the exact diagnosis.

Does biopsy make SCC spread?

There is no evidence that a properly planned biopsy causes nasal SCC to spread throughout the body.

The much greater risk is delaying diagnosis until the lesion becomes too extensive for a straightforward local treatment.

3. CT Imaging

A small, flat superficial lesion may not require CT before every treatment. CT becomes much more valuable when:

• The lesion is thick or deeply ulcerated

• A nostril is narrowed or distorted

• The tumour extends onto the upper lip

• Internal extension is suspected

• Bone involvement is possible

• Surgery or external-beam radiation is being planned

• Previous treatment has failed

• The true depth cannot be determined clinically

The visible surface can underestimate how far an invasive tumour extends beneath the skin.

4. Cancer Staging

Staging may include:

• Fine needle aspiration of regional lymph nodes

• Chest radiographs

• Thoracic CT

• Complete blood count

• Serum biochemistry

• Urinalysis

The extent of staging should reflect the tumour’s size, invasiveness and intended treatment. A tiny superficial lesion and a large destructive facial tumour do not require identical investigations.

How Is Intranasal SCC Diagnosed?

1. Head CT

CT is the most useful imaging test for evaluating a suspected nasal tumour.

It can show:

• Which side of the nasal cavity is involved

• Destruction of nasal turbinates

• Bone invasion

• Sinus involvement

• Extension towards the orbit

• Extension towards the brain

• Whether the tumour is unilateral or bilateral

• Regional lymph node changes

• The safest area for biopsy

• The area that radiation treatment would need to cover

CT cannot reliably identify the tumour type on appearance alone. Lymphoma, SCC, adenocarcinoma, fungal disease and severe inflammation can overlap on imaging.

2. Nasal Biopsy

Biopsy may be obtained using:

• Rhinoscopy

• Endoscopic biopsy forceps

• Image-guided instruments

• A nasal flushing or retrieval technique

• Surgery in selected cases

The sample must be submitted for histopathology. Immunohistochemistry may be needed when the tumour is poorly differentiated or lymphoma remains a possibility.

This distinction is essential because feline nasal lymphoma and intranasal carcinoma are treated differently. A CT showing a mass does not automatically establish SCC.

3. Additional Testing

Depending on the cat and location, the investigation may include:

• Regional lymph node sampling

• Chest imaging

• Complete blood count

• Serum biochemistry

• Urinalysis

• Blood pressure

• Fungal testing

• Cryptococcal antigen testing

• Bacterial culture in selected cases

• Dental assessment

A positive bacterial culture does not necessarily mean infection is the primary disease. Tumours can obstruct drainage and develop secondary bacterial infection.

What Else Can Look Like Nasal SCC?

Conditions affecting the external nose

Possible alternatives include:

• Actinic dermatitis

• Superficial trauma

• Bacterial skin infection

• Fungal infection

• Feline herpesvirus-associated dermatitis

• Eosinophilic granuloma complex

• Pemphigus or another immune-mediated disease

• Insect bites

• Basal cell or basosquamous carcinoma

• Melanoma

• Mast cell tumour

• Haemangiosarcoma

• Another cutaneous tumour

Conditions affecting the nasal cavity

Important differentials include:

• Chronic inflammatory rhinitis

• Feline nasal lymphoma

• Adenocarcinoma

• Cryptococcosis

• Another fungal granuloma

• Nasopharyngeal polyp

• Foreign material

• Dental root disease

• Oronasal fistula

• Nasal trauma

• Another epithelial or mesenchymal tumour

In the large feline nasal tumour study, lymphoma was more common overall than any single epithelial tumour type. This is why a biopsy is necessary rather than assuming every feline nasal mass is SCC.

How Is Nasal Planum SCC Treated?

Treatment is selected according to:

• Tumour depth

• Tumour size

• Exact location

• Whether the nostril is involved

• Whether the upper lip is involved

• Histological stage

• Previous treatment

• Availability of specialist equipment

• The cat’s health

• The owner’s goals

There is no single best treatment for every nasal planum lesion.

Surgery and Nasal Planectomy

Surgery may involve:

• Removal of a small localised lesion

• Partial nasal planectomy

• Complete nasal planectomy

• Removal of part of the upper lip

• Reconstructive surgery using a local skin or lip flap

Surgery provides the removed tissue for margin assessment and can be highly effective when the cancer can be completely excised.

Cats generally adapt better to removal of the external nasal planum than owners initially expect. The appearance changes, but airflow may remain functional once postoperative swelling resolves.

A small surgical series using a lip-to-nose flap after partial nasal planectomy reported successful healing in all seven cats, without major healing complications. Owner-rated long-term function and cosmetic outcomes were considered good.

When is surgery most useful?

Surgery is particularly valuable when:

• The lesion is invasive

• A clean margin appears achievable

• Superficial radiation will not penetrate deeply enough

• The tumour is confined to a surgically removable area

• Histological margin assessment is important

• The owner accepts the expected change in appearance

The limitation is that advanced lesions may extend farther than they appear, and obtaining clean margins can require substantial removal of the nose or upper lip.

Strontium-90 Plesiotherapy

Strontium-90 is a form of superficial radiation applied directly to the lesion using a specialised probe.

It is best suited to:

• Superficial SCC

• Carcinoma in situ

• Small early-stage lesions

• Tumours without deep tissue or bone invasion

The radiation does not penetrate deeply, which protects underlying structures but also makes it unsuitable for thick invasive disease.

In a study of 74 cats, strontium-90 treatment produced a complete response in 74%. The median disease-free interval was 780 days, and the median overall survival was 1,039 days. Early-stage disease and complete response were associated with better outcomes.

A separate study of 49 cats reported an 88% complete response rate, a median progression-free survival of 1,710 days and a median overall survival of 3,076 days. Treatment complications were uncommon and generally mild.

These results cannot be applied to every cat because the study populations, tumour stages and protocols differed. They do show that small superficial nasal planum SCC can have an excellent long-term outcome when treated early.

External-Beam Radiation Therapy

External-beam radiation can treat a deeper or broader area than strontium-90.

It may be considered when:

• The tumour is too large or deep for superficial treatment

• Surgery would be excessively destructive

• Histological margins are incomplete

• The lesion has recurred

• Several nearby areas require treatment

• The owner prefers a non-surgical local treatment

Radiation protocols vary between facilities. Multiple short anaesthetics are usually required to position the cat accurately.

In a study of 44 cats treated with an accelerated radiation protocol for nasal planum SCC, every cat achieved a complete response. Median disease-free interval was 916 days and median overall survival was 902 days. Larger tumour volume was associated with a poorer outcome.

Brachytherapy

Brachytherapy delivers radiation close to or within the tumour.

High-dose-rate brachytherapy may provide strong local treatment while limiting exposure to deeper tissues.

In a study of 58 cats with nasal planum SCC, 72% achieved a complete response. Median progression-free survival was 316 days and median overall survival was 835 days. Larger tumours and extension onto the upper lip were associated with poorer outcomes.

Availability is limited, and the most appropriate radiation technique depends on tumour shape, depth and the equipment available at the referral centre.

Electrochemotherapy

Electrochemotherapy combines chemotherapy, usually bleomycin, with brief electrical pulses that temporarily increase cancer-cell uptake of the drug.

It may be used for:

• Small superficial tumours

• Larger locally advanced tumours

• Lesions where surgery would be highly disfiguring

• Residual or recurrent local disease

A 2025 study involving 23 cats with cutaneous SCC, most of which affected the nasal planum, reported complete response in approximately two-thirds of patients. Early-stage tumours responded more favourably than more advanced disease.

In a separate study of 21 cats with locally advanced nasal planum SCC, 19 achieved a complete response and two achieved a partial response. Median overall survival was 453 days, but substantial short-term tissue toxicity occurred in some cats.

Electrochemotherapy can be an effective option, but results depend on tumour stage, electrode design, treatment technique and access to experienced providers.

Curettage and Diathermy

Curettage removes diseased superficial tissue, while diathermy uses electrical energy to destroy residual abnormal cells and control bleeding.

In a study of 34 cats with actinic dysplasia or superficial SCC involving less than half of the nasal planum:

• All cats achieved a complete response

• Two developed clinical recurrence

• The probability of remaining disease-free at 12 months was 94%

• Cosmetic outcome was generally good

This technique is not intended for deep, thick or highly invasive tumours.

Photodynamic Therapy

Photodynamic therapy uses a photosensitising agent and a specific wavelength of light to destroy abnormal cells.

It can be useful for superficial disease and may preserve the appearance of the nose.

In a prospective study of 55 cats with superficial nasal planum SCC:

• 96% responded

• 85% achieved a complete response

• Approximately half of the complete responders later developed recurrence after one treatment

• Repeat treatment was possible

• Adverse effects were generally mild and temporary

Photodynamic therapy can provide an excellent initial response, but recurrence is more common than with some other early-stage treatments.

Cryotherapy

Cryotherapy destroys abnormal tissue by freezing it.

It may be considered for selected small, superficial lesions, particularly when equipment and experience are available. Treatment depth can be more difficult to control than with some radiation techniques, and recurrence is more likely if invasive cells extend beyond the frozen area.

It is not generally the strongest choice for a thick tumour, nostril invasion or extensive upper-lip involvement.

Chemotherapy

Systemic chemotherapy alone is not usually the main treatment for localised nasal planum SCC.

Intralesional chemotherapy and chemotherapy combined with radiation have been investigated, but local control remains the central priority.

Chemotherapy may still be discussed when:

• The tumour cannot be removed or irradiated adequately

• Metastasis is present

• It forms part of an electrochemotherapy protocol

• A veterinary oncologist recommends a combined treatment approach

The exact role depends heavily on the tumour’s location and stage.

How Is Intranasal SCC Treated?

Radiation Therapy

Radiation therapy is the main treatment for most cats with intranasal carcinoma because wide surgical removal is rarely possible within the nasal cavity.

Options include:

• Conventionally fractionated definitive radiation

• Stereotactic radiation

• Hypofractionated radiation

• Palliative radiation

Definitive treatment aims for longer tumour control but usually involves more planning, anaesthetic episodes and expense. Palliative treatment uses fewer fractions and focuses on improving breathing, bleeding and comfort.

In a multicentre study of 42 cats with intranasal carcinoma, definitive-intent radiation produced a median progression-free survival of 504 days and median overall survival of 721 days. Cats receiving palliative radiation had a median progression-free survival of 198 days and median overall survival of 284 days.

Those results included several types of intranasal carcinoma rather than SCC alone. They should therefore be used as general guidance for feline intranasal carcinoma, not as a guaranteed SCC-specific survival estimate.

Can an intranasal tumour be treated again if it returns?

Sometimes.

Selected cats with recurrence may be considered for a second radiation course. Suitability depends on:

• The original dose

• Time since the first treatment

• Current tumour location

• Changes to surrounding bone

• Eye and brain exposure

• Previous radiation effects

• Overall health

• Expected quality-of-life benefit

The multicentre intranasal carcinoma study found longer survival among cats receiving a second definitive radiation course, but this was retrospective and the cats selected for repeat treatment were likely healthier candidates.

Surgery

Surgery is not usually the main standalone treatment for a deep intranasal SCC because the tumour may extend through delicate bones and tissues where wide margins are difficult to obtain.

Surgery may still be used for:

• Obtaining a biopsy

• Removing obstructive tissue

• Treating a very rostral or localised lesion

• Managing a complication

• Debulking before another therapy in selected cases

Debulking is not the same as complete removal. Residual microscopic and visible tumour may continue growing unless another form of local treatment is used.

Chemotherapy

The benefit of systemic chemotherapy for intranasal SCC is not well established.

It may be discussed when:

• Metastatic disease is present

• Local treatment is not possible

• Radiation is being combined with another therapy

• The pathologist identifies a tumour type likely to respond

• A clinical trial is available

This is another reason biopsy matters. Nasal lymphoma may respond well to chemotherapy, while an epithelial SCC generally requires a stronger local treatment plan.

Palliative Care

Palliative treatment focuses on controlling:

• Nasal pain

• Inflammation

• Bleeding

• Secondary infection

• Reduced appetite

• Dehydration

• Breathing difficulty

• Anxiety caused by obstruction

A palliative plan may include radiation, pain relief, anti-inflammatory medication, antibiotics for documented secondary infection, appetite support and nutritional care.

Antibiotics may temporarily improve discharge or odour but cannot control the tumour itself.

How Do Vets Choose the Best Treatment?

Clinical situation	Treatment commonly considered
Actinic damage or very superficial external lesion	Curettage and diathermy, photodynamic therapy, superficial radiation, electrochemotherapy or limited surgery
Small superficial nasal planum SCC	Strontium-90, surgery, photodynamic therapy or electrochemotherapy
Thick or invasive nasal planum SCC	Nasal planectomy, external-beam radiation, brachytherapy or electrochemotherapy
External tumour extending into a nostril or upper lip	CT-based planning followed by surgery, radiation or a combined approach
Intranasal SCC	Definitive or palliative radiation, with other treatment guided by biopsy and staging
Advanced tumour in a medically fragile cat	Comfort-focused radiation, pain relief, nutritional support and hospice care

The best treatment is not simply the one with the highest response rate in one study. It is the treatment capable of reaching the full depth of the individual tumour while preserving acceptable function and quality of life.

What Is the Prognosis?

Prognosis for Nasal Planum SCC

The outlook can be excellent when an external lesion is detected while it remains small and superficial.

Several treatment studies have reported disease control lasting years in many appropriately selected cats. Early stage, smaller tumour size and complete treatment response are repeatedly associated with better outcomes.

The prognosis becomes more guarded when:

• The tumour is large

• It has invaded deeply

• The nostril is distorted

• The upper lip is involved

• Clean surgical margins cannot be obtained

• The tumour has returned after treatment

• Regional lymph nodes are involved

• The cat has serious concurrent disease

Even after successful treatment, another sun-related lesion may develop on a different part of the nose, eyelid or ear. In one strontium-90 study, one-third of cats developed new lesions at other sites during follow-up.

Prognosis for Intranasal SCC

The prognosis for intranasal SCC is generally more guarded because the tumour is often extensive before it becomes visible and may invade surrounding bone.

Radiation can still provide meaningful control. In broader feline intranasal carcinoma populations, definitive radiation has produced median survival measured in years rather than weeks, while palliative protocols generally provide shorter control.

Individual prognosis depends on:

• Exact histological diagnosis

• Tumour stage

• Unilateral versus bilateral disease

• Bone destruction

• Orbital or brain extension

• Response to radiation

• Ability to complete treatment

• Presence of metastasis

• Concurrent kidney, heart or other disease

Published survival figures describe groups of cats. They cannot predict exactly what will happen to one individual patient.

Is Nasal SCC Painful?

It can be.

External SCC may:

• Ulcerate

• Expose sensitive tissue

• Bleed

• Become infected

• Invade cartilage and nearby skin

• Narrow the nostrils

Intranasal SCC may:

• Create pressure within the nasal cavity

• Destroy bone

• Obstruct airflow

• Extend around the eyes

• Cause headaches or facial discomfort

• Produce repeated bleeding

Cats often hide pain by becoming quiet, sleeping more, grooming less or withdrawing from contact.

Possible pain signs include:

• Rubbing or pawing at the face

• Resisting facial touch

• Reduced grooming

• Hiding

• Irritability

• Eating more slowly

• Walking away from food

• Reduced activity

• Difficulty settling

Pain management should be discussed from the beginning rather than saved only for the final stage of disease.

What Happens After Treatment?

After Nasal Planum Surgery

Expected temporary changes may include:

• Facial swelling

• Bruising

• Mild bleeding

• Nasal discharge

• Reduced appetite

• Altered airflow

• Crusting during healing

• A visible change in facial appearance

Your cat may need:

• An Elizabethan collar

• Pain relief

• Soft food

• Wound cleaning as instructed

• Antibiotics when infection is present

• A short hospital stay

• A feeding tube in selected cases

Do not apply antiseptic, peroxide, essential oil, human cream or sunscreen to the surgical site unless the surgeon has specifically approved it.

After Radiation

Short-term reactions may include:

• Redness

• Swelling

• Crusting

• Moist skin irritation

• Nasal discharge

• Sneezing

• Conjunctivitis

• Temporary hair loss

• Reduced appetite

Late changes can include:

• Permanent hair loss

• White hair regrowth

• Pigment change

• Fibrosis

• Chronic discharge

• Tissue ulceration

• Rare damage to the eyes, bone or surrounding structures

The radiation oncologist should explain the expected reaction for the particular protocol because treatment fields and doses differ substantially.

Follow-Up Monitoring

Follow-up may include:

• Examination of the treatment site

• Photographs and measurements

• Regional lymph node assessment

• Repeat CT

• Chest imaging

• Blood and urine testing

• Review of pain and appetite

• Examination of the ears and eyelids for new sun-related lesions

Rechecks are generally more frequent during the first months after treatment and become less frequent if the site remains stable.

Contact the treating clinic before the scheduled recheck if new crusting, swelling, bleeding, discharge or breathing changes develop.

When Is Nasal SCC an Emergency?

Go to an emergency veterinary hospital immediately if your cat develops:

• Open-mouth breathing

• Marked respiratory effort

• Blue or grey gums

• Inability to settle because of breathing difficulty

• Continuous or heavy nasal bleeding

• Collapse

• Severe weakness

• Seizures

• Circling or profound disorientation

• Reduced consciousness

• Rapidly increasing facial swelling

• Sudden severe swelling around an eye

• Inability to swallow

• Choking or repeated aspiration

Arrange same-day veterinary care if your cat:

• Has repeated nosebleeds

• Is eating almost nothing

• Appears dehydrated

• Has rapidly worsening nasal obstruction

• Develops a painful or infected external lesion

• Has foul-smelling discharge with lethargy

• Is losing weight quickly

• Appears painful despite medication

A blocked nose can become particularly distressing for a cat because cats strongly prefer nasal breathing. Open-mouth breathing at rest should never be dismissed as simple congestion.

What Should You Do Next?

1. Photograph the lesion or discharge

For an external lesion, take a clear photograph in good light with a ruler beside it.

For internal signs, record:

• Which nostril is affected

• Colour of the discharge

• Frequency of bleeding

• Sneezing episodes

• Breathing sounds

• Appetite

• Body weight

• Any facial swelling

2. Arrange an examination promptly

A recurring external scab should be examined within the next few days.

Persistent one-sided nasal discharge or bleeding should also be investigated rather than repeatedly treated as an infection.

3. Ask whether a biopsy is needed

Any non-healing or progressive external lesion generally deserves tissue diagnosis.

An internal nasal mass also requires biopsy because lymphoma, carcinoma and fungal disease need different treatment.

4. Ask whether CT should be performed

CT is particularly important when:

• A nostril is involved

• The external lesion is invasive

• Facial swelling is present

• Nasal airflow is reduced

• Surgery or radiation is being planned

• Intranasal disease is suspected

5. Request referral before unplanned major surgery

A veterinary oncologist, radiation oncologist or surgical oncologist can help determine whether the strongest option is:

• Local excision

• Nasal planectomy

• Superficial radiation

• External-beam radiation

• Electrochemotherapy

• Another local treatment

Removing part of a lesion without an adequate margin can make later treatment more difficult.

6. Discuss the treatment goal

Ask whether the plan is intended to:

• Cure the cancer

• Achieve long-term local control

• Delay progression

• Improve breathing

• Reduce pain and bleeding

• Provide comfort-focused care

Clear goals make it easier to judge whether treatment is helping.

7. Create an emergency plan

Know:

• Which signs require an urgent call

• Where the nearest emergency hospital is

• What to do during a nosebleed

• Which pain medication is safe

• What to do if food intake falls

• Who to contact after hours

Common Mistakes Owners Should Avoid

Assuming every nasal SCC is caused by sunlight

Sunlight is strongly associated with external nasal planum SCC, not with every tumour growing inside the nasal cavity.

Repeatedly peeling off the scab

Removing the crust may make the lesion appear temporarily smaller while causing bleeding and delaying proper assessment.

Repeating antibiotics without obtaining a diagnosis

Secondary infection may improve while the underlying cancer continues to grow.

Waiting for a visible lump

Early nasal planum SCC often begins as scale, crust or a shallow ulcer.

Assuming an indoor cat cannot develop nasal cancer

Indoor living reduces ultraviolet exposure but does not eliminate the possibility of intranasal cancer or all forms of cutaneous cancer.

Applying human sunscreen or skin cream

Cats may lick topical products. Some ingredients can cause irritation or illness when swallowed. Use only a product and application plan approved by your veterinarian.

Choosing treatment before staging the tumour

A superficial treatment cannot control a deeply invasive lesion, while radical surgery may be unnecessary for a tiny carcinoma in situ.

Treating CT appearance as a final diagnosis

Imaging shows the location and extent of disease. A biopsy identifies what the disease actually is.

Waiting until breathing or eating becomes difficult

Treatment options narrow as local invasion progresses. The best time to act is often when the lesion still looks disappointingly small.

Can Nasal SCC Be Prevented?

Reducing Nasal Planum SCC Risk

The risk of ultraviolet-related disease can be reduced by:

• Keeping light-coloured cats indoors during periods of intense sunlight

• Providing shade in outdoor enclosures

• Preventing prolonged sunbathing in exposed locations

• Checking the nose, ear tips and eyelids regularly

• Photographing subtle pigment or texture changes

• Discussing cat-safe sun protection with a veterinarian

• Investigating actinic lesions before they become invasive

Sun avoidance cannot reverse cancer that is already present. A persistent lesion still requires examination and possible biopsy.

Preventing Intranasal SCC

There is no proven method of preventing SCC arising inside the nasal cavity.

The most useful strategy is early investigation of:

• Persistent one-sided nasal discharge

• Recurring nosebleeds

• Reduced airflow

• Facial swelling

• Unexplained weight loss

• Nasal signs that fail to respond as expected

A senior cat should not receive endless courses of antibiotics for unilateral discharge without a plan to investigate the underlying cause.

Frequently Asked Questions

Can nasal squamous cell carcinoma in cats be cured?

Early external nasal planum SCC may be cured or controlled for years with complete local treatment. Intranasal SCC is more difficult to cure, but definitive radiation can provide meaningful long-term control in selected cats.

Is a recurring scab on a cat’s nose always cancer?

No. Trauma, infection, immune-mediated disease and actinic damage can produce similar lesions. However, any scab or ulcer that persists or repeatedly returns should be biopsied rather than assumed to be harmless.

Will a cat cope after nasal planectomy?

Many cats adapt well once pain and swelling resolve. The appearance of the nose changes, but breathing and eating can remain functional. The expected extent of surgery and reconstruction should be discussed using photographs from comparable cases.

Does nasal SCC spread to the lungs?

It can, but local invasion is usually the main concern with early cutaneous nasal planum SCC. Metastatic risk becomes more important with larger, deeply invasive or recurrent tumours, which is why lymph node and chest staging may be recommended.

How long can a cat live with nasal SCC?

Some cats with small external lesions live for several years after successful treatment. Cats with intranasal carcinoma treated using definitive radiation had a median survival of approximately 721 days in one multicentre study, while cats receiving palliative radiation had a median survival of approximately 284 days. Those figures included several carcinoma types and cannot predict an individual cat’s outcome.

Final Takeaway

Nasal squamous cell carcinoma in cats describes two different clinical problems.

A crusted or ulcerated lesion on the external nasal planum is commonly associated with long-term ultraviolet exposure. When detected while small and superficial, it may respond extremely well to surgery, strontium-90, radiation, electrochemotherapy, curettage or photodynamic therapy.

A tumour growing inside the nasal cavity more often causes persistent one-sided discharge, bleeding, sneezing, noisy breathing or facial swelling. CT shows its extent, but biopsy is required to distinguish SCC from lymphoma, adenocarcinoma, fungal disease and other conditions. Radiation is usually the central treatment for confirmed intranasal carcinoma.

The most important practical lesson is not to wait for either form to become obvious. A recurring nose scab deserves investigation, and persistent unilateral nasal discharge should not be managed indefinitely as a simple infection.

Early diagnosis provides more treatment options, less destructive treatment and the greatest chance of maintaining comfortable breathing and a good quality of life.

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If you are unsure whether your cat’s nose lesion, nasal discharge, bleeding or biopsy result requires urgent care, ASK A VET™ can help you organise the information and understand what questions to discuss with your veterinarian next.