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Understanding Mast Cell Tumors

Mast cells are a type of white blood cell and are a normal part of the immune system of cats. However, these cells may begin to proliferate in an abnormal way, causing tumors on the skin of felines or on internal organs. Mast cell tumors occur more frequently in older cats and in certain breeds of cats, such as Siamese. They are generally small tumors, raised, without any hair growing on them. They may be itchy and may be constantly licked or groomed by the cat. Cats with internal mast cell tumors may vomit frequently, have diarrhea or may lose their appetites.  Our staff at Trinity Pet Hospital in Laguna Hills wants you to understand mast cell tumors and how we can treat them should your cat develop this condition.

Understanding Mast Cell Tumors

Diagnosis of Mastocytoma

Veterinarians will do a biopsy to remove a sample of tissue from the tumor. This process may require sedation of the animal, depending on where the tumor is located. The tissue will be examined under a microscope to determine whether it is benign or malignant. Simple remove may be sufficient for benign tumors. However, malignant mast cell tumors often require additional treatment besides the removal.

Treatment for Mast Cell Tumors

Mast cell tumors produce histamine in the body, so your vet in Laguna Hills will administer antihistamine medications to reduce itching and other effects. Tumors on the skin are generally removed surgically and the area allowed to heal. Cats generally do well after cutaneous mast cell tumor removal, but the growth may recur. Internal mast cells are also removed surgically, and additional chemotherapy may be required. The success of outcomes often depends on how widely the tumor has spread.

Make Trinity Pet Hospital Your Veterinarian in Laguna Hills

Dr. Kerolos and the team at Trinity Pet Hospital are committed to providing quality care for all of their patients in Laguna Hills, CA and other communities in the area. We provide a range of veterinary services, such as vaccinations, spay & neuter surgery, preventative care, dentistry, dermatology, and pain management. You can call Trinity Pet Hospital today at (949) 768-1314 for an appointment to learn about current treatments for mast cell tumors in cats.

Location and Hours

24861 Alicia Pkwy, Laguna Hills, CA 92653


7:00 am - 6:00 pm


7:00 am - 6:00 pm


7:00 am - 6:00 pm


7:00 am - 6:00 pm


7:00 am - 6:00 pm


8:00 am - 3:00 pm



Trinity Pet Hospital


24861 Alicia Pkwy,
Laguna Hills, CA 92653