Ovarian Cancer in Cats

Common info

Epithelial tumors, germ cell tumors, and sex-cord stromal tumors are three major types of ovarian cysts found in cats. The most common type of ovarian tumors found in cats is sex-cord (granulosa-theca cell. The symptoms of ovarian cancer include fever, lethargy, loss of appetite, weight loss, breathing difficulty, and vaginal discharge, etc.


Although the cause of ovarian cancer in cats is not known, it is often associated with the hormone disorder in non-spayed cats, infections, chemical, and radiation exposure. In a part of senior cats, age is also one of the factors causing the cancer.


Ovary is a vital organ in a female cat’s uterine cavity that produces eggs and female sex hormones. The tumors developed in an ovary may be either benign or malignant (cancer), which causes different effects on the body. While the epithelial tumors influence the skins and tissues, the germ cell tumors attack the sperms and eggs. On the other hand, the sex-cord stromal tumors, upon malignant development, will cause an impact on the connective tissue. When pets get cancer, the cancerous tumor will start growing in the ovary, the organ from where it will spread to other parts of the body.


  • Fever
  • Lethargy
  • Loss of appetite
  • Weight loss
  • Breathing difficulty
  • Vaginal discharge
  • Excessive loss of hair
  • Abdominal cavity enlargement
  • Abdominal distension
  • Breast enlargement
  • Fluids build-up in abdominal
  • Fluids build-up in chest cavities
  • Uterine infection

The symptoms of ovarian cancer in cats include fever, lethargy, loss of appetite, weight loss, excessive loss of hair, breast enlargement, abdominal cavity enlargement, uterine infection, vaginal discharge, breathing difficulty, fluids build-up in abdominal, abdominal distension, and fluids build-up in chest cavities. 

Treatment and Prevention

Regularly, a surgical removal of the benign tumor can complete without a problem. However, it may be more difficult in the case of malignant tumors as this involves the chance of infection and spread to other parts of the body.  Primarily, the veterinarian will have the pet spayed before removing the tumor. Along with the surgery, chemotherapy may also be applied to reduce the chance of the spread into other body organs.

  1. Wagwalking | Ovarian tumors
  2. Petmd | Ovarian Tumors in Cats
  3. Webmd. | What Is Ovarian Cancer? What Causes It?
  4. Gelberg, H. B., & McEntee, K. 1985. Feline Ovarian Neoplasms. Veterinary Pathology, 22(6), 572–576.
  5. N. James MacLachlan. 1987.Ovarian Disorders in Domestic Animals. Environmental Health Perspectives. 73: 27-33.
Pet AZ Адрес +7 495 123-45-67