CATS · Condition guide
Feline squamous cell carcinoma: real veterinary cases
Squamous cell carcinoma is the most common skin cancer in cats, and the most preventable: cutaneous SCC is overwhelmingly sun-induced and clusters on the hairless, lightly-pigmented parts of white or partly-white cats — the ear tips, nose, and eyelids. The progression is predictable: chronic redness → scaling → crusting that won't heal → erosion → invasive tumour. Catching it before invasion is the difference between a small surgical excision and ear amputation.
Oral squamous cell carcinoma is a separate, more aggressive form — fast-growing tumours under the tongue or in the jaw that often present late because cats hide oral pain. Prognosis for oral SCC is unfortunately poor. For early cutaneous SCC, treatment options include surgical excision (often pinnectomy — ear-tip removal), strontium-90 plesiotherapy, electrochemotherapy, and topical imiquimod. Sun avoidance and feline-safe sunscreen on at-risk cats is the only effective prevention.
What vets typically check for
- Biopsy or fine-needle aspirate of any non-healing lesion on at-risk sites in white/light-coated cats.
- Stage with regional lymph node aspirate; chest radiographs if invasive disease.
- Pinnectomy (surgical removal of ear tip) is curative for early SCC of the ear.
- Strontium-90 plesiotherapy or electrochemotherapy for non-resectable cutaneous SCC.
- Oral SCC: incisional biopsy, CT imaging, multimodal therapy via specialist referral.
Not a replacement for veterinary care. Use this to walk into the conversation prepared, not to self-diagnose.
Real cases from the veterinary literature
Peer-reviewed reports our semantic search surfaces for Squamous cell carcinoma in cats. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Fine needle aspiration cytology in feline skeletal muscle as a diagnostic tool for extramedullary plasmacytoma
Arquivo Brasileiro de Medicina Veterinária e Zootecnia · BR
An 8-month-old male mixed breed cat was found to have a nodule in its left hind leg, which led to a diagnosis of extramedullary plasmacytoma, a rare type of tumor. A fine needle aspiration cytology test was performed, confirming the presence of abnormal plasma cells. The cat also tested positive for feline leukemia virus (FeLV), which can complicate health issues. Unfortunately
- Glycogen-rich clear cell carcinoma of the feline mammary gland: case report
Arquivo Brasileiro de Medicina Veterinária e Zootecnia · BR
A Persian cat was brought to the vet with tumors in her mammary glands. She underwent surgery to remove one of the affected glands, but unfortunately, she only survived for 33 days after the operation due to the progression of her cancer. The diagnosis was glycogen-rich clear cell carcinoma, a type of cancer that can spread to other areas. This case highlights the importance of
- EXPRESS: Diode laser surgery for palpebral apocrine cystadenomatosis: a retrospective case series of four cats.
Journal of feline medicine and surgery · 2026 · France
Four cats, including three Persians and one Siberian, were brought to the vet for greyish lesions on their eyelids that had been growing for one month to a year. They were diagnosed with palpebral apocrine cystadenomatosis, a rare benign condition affecting the eyelid glands. All cats underwent diode laser surgery to remove the lesions while under general anesthesia, and none e
- Histological and immunohistochemical features of a feline sarcomatoid renal cell carcinoma.
Journal of comparative pathology · 2026 · Australia
A 7-year-old male Domestic Shorthair cat was brought in due to progressive weight loss, kidney enlargement on the right side, and elevated waste products in the blood. Sadly, the cat was diagnosed with a rare type of kidney cancer called sarcomatoid renal cell carcinoma (SRCC) after a necropsy revealed a large mass in the right kidney. The tumor was made up of various abnormal
- Assessment of the diagnostic accuracy of clinical signs in feline diffuse iris melanoma.
Frontiers in veterinary science · 2026 · Germany
A 10-year-old female Domestic Shorthair cat was brought in for eye problems, including thickening of the iris and pigment changes. After a thorough examination, the veterinarian suspected diffuse iris melanoma, a type of eye cancer, and recommended enucleation (removal of the eye). The surgery confirmed the diagnosis in most cases, showing that iris thickening was a strong indi
- Cutaneous paraneoplastic syndromes in cats: a comparative clinical review
Journal of Feline Medicine and Surgery · 2026 · United Kingdom
A 10-year-old domestic shorthair cat was brought in with unusual skin problems, which can sometimes indicate hidden cancers. The vet suspected a cutaneous paraneoplastic syndrome (CPS), a skin issue linked to underlying tumors. To confirm the diagnosis, the vet performed skin biopsies and imaging tests to check for tumors. Treatment focused on addressing the cancer, and in some
Frequently asked questions
- How do I prevent it?
- Keep at-risk cats (white, partly white, or pink-skinned) indoors during peak sun (10am-4pm), or apply feline-safe (zinc-free) sunscreen to ear tips and nose. Any crusty or non-healing lesion on a white cat's ear, nose, or eyelid deserves a biopsy before it becomes invasive.
- What's the difference between cutaneous and oral SCC?
- Cutaneous SCC on white cats' ears or nose is sun-induced, slow to spread, and curable if caught early. Oral SCC — in the jaw or under the tongue — is unrelated to UV, aggressive, often metastasises locally, and has a much poorer prognosis. Drooling, weight loss, or a visible mass in a cat's mouth warrants urgent investigation.
- Will pinnectomy bother my cat?
- Cats tolerate ear-tip removal remarkably well — most are back to normal behaviour within days. The cosmetic change is minor and the procedure is genuinely curative for non-invasive SCC of the pinna.