Skin Cancer (Basal Cell Tumor) in Cats Leave a comment

Basal Cell Tumor in Cats

Basal cell tumor is the one of the most common skin cancers in animals. In fact, it accounts for 15 to 26 percent of all skin tumors in cats. Originating in the skin’s basal epithelium — one of the deepest skin layers — basal cell tumors tend to occur in older cats, especially Siamese cats.

Symptoms and Types

As with other tumors, basal cell tumors can either be benign (e.g., basal cell epithelioma and basaloid tumor) or malignant (e.g., basal cell carcinoma). However, metastasis is rare and less than 10 percent of basal cell tumors are malignant. And though variable in size (0.2 to 10 centimeters in diameter), it most often appears as a solitary, well-circumscribed, formed, hairless, raised mass in the skin, typically located on the cat’s head, neck, or shoulders. Masses in cats are also often heavily pigmented, cystic, and occasionally ulcerated.


The underlying cause for a basal cell tumor is currently unknown.


You will need to give a thorough history of your cat’s health, including the onset and nature of the symptoms, to the veterinarian. He or she will then perform a complete physical examination as well as a biochemistry profile, urinalysis, complete blood count, and electrolyte panel.

Fine needle aspiration cytology, whereby cells extracted from just under the skin for evaluation, may reveal round cells with dark blue cytoplasm. Occasionally, cells may even be dividing at an alarming rate, also known as high mitotic rate. For definitive diagnosis, however, a diagnostic procedure known as histopathologic examination is needed. This will involve examining thin slices of the tumor under a microscope.


While cryosurgery (freezing via liquid nitrogen) can be used for smaller lesions (smaller than one centimeter in diameter), surgical excision is the preferred method of treatment. Most cats recover fully after surgery.

Living and Management

The overall prognosis for cats with basal cell tumor is good. In fact, many are completely cured once the tumor is surgically excised.


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