Tumors of the Vagina in Cats


PetMD Editorial

Published Mar. 20, 2010

Vaginal Tumors in Cats


Vaginal tumors in cats are extremely rare and are usually of benign smooth muscle origin. (There are several types of smooth muscle tumors, including leiomyoma; fibroleiomyoma, a fibrous tissue and smooth muscle tissue tumor; and fibroma, a fibrous tissue tumor.) A vaginal tumor may never bother the cat (and thus never be diagnosed), or it may cause complications that are not a direct result of the tumor, but a result of its presence in the body, such as with uterine leiomyomatas, which can cause excessive menstrual bleeding. Other complications can include constipation, and difficulty with birthing.


Symptoms and Types


  • Firm mass
  • Constipation
  • Discharge from the vagina                




Female cats that are unspayed are most commonly affeted with vaginal tumors, especially those that have never given birth.




Your veterinarian will perform a thorough physical exam on your cat, taking into account the background history of symptoms and possible incidents that might have led to this condition. Your veterinarian will order a blood chemical profile, a complete blood count, a urinalysis and an electrolyte panel. A vaginoscopy will be performed. This method uses a tiny instrument that is equipped with a camera for inspecting the inside of the vagina, and which is capable of cutting and gathering tissue for biopsy. The biopsy, along with a cytologic examination of an aspirate taken from the vaginal tissue may help to determine the vaginal tumor’s cell type. An examination of vaginal cells and tissue is necessary for a definitive diagnosis to be made. 


Chest X-rays should also be taken to check for spread of the cancer. Abdominal X-rays may show the vaginal tumor, while ultrasonography, vaginography, and urethrocystography may help to visualize a mass. Computed tomography (CT) and/or magnetic resonance imaging (MRI) will give a clearly outlined image of a tumor, allowing your doctor to assess for surgical feasibility, and to assess for possible degree of cancerous spread.




Surgical removal of the vaginal tumor with a concurrent spaying of the patient is the treatment of choice. For sarcomas and mast cell tumors (which are malignant), or for benign tumors which can not be completely removed, post-operative radiotherapy is indicated. 


Living and Management


Your veterinarian will schedule follow-up appointments with you to have your cat X-rayed. Depending on the severity and type of the tumor, these follow-ups may be as frequent as every three months if the tumor was malignant (aggressive and spreading). Bloodwork will be done before each chemotherapy treatment to check on your cat's health status and progress.

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