Bone Cancer in Cats Caused by Hemangiosarcoma
Hemangiosarcoma is a type of cancer in cats that arises from blood vessels and can occur almost anywhere in the body. It is a highly metastatic form of cancer, meaning it spreads readily to other tissues. Usually when hemangiosarcoma occurs in bone it is due to metastasis from another site, although rarely, it may actually arise in the bone; the bone is then referred to as the primary site.
This tumor affects the bone much more rarely than osteosarcoma, but when it occurs in bone it can sometimes be very difficult to distinguish from the osteosarcoma. The cause of hemangiosarcoma is largely unknown. In people this type of cancer has been linked to exposure to vinyl chloride, a chemical agent.
The bone form of hemangiosarcoma is rare in cats, but can occur as a local extension of tumors of the soft tissues. It can affect the axial skeleton, which includes the bones of the spine, pelvis and skull, as well as the appendicular skeleton, which includes the arms and legs.
This is a lethal form of cancer in your pet. Average survival rate in animals with this type of cancer, even with treatment, is only months. In most cases, the tumor has already spread widely or will spread widely throughout the body, despite therapy and will continue to grow. When it primarily affects the bone, it can cause lameness and general debilitation of your pet during its development and progression.
What to Watch For
Diagnosis of Hemangiosarcoma of the Bone in Cats
Diagnostic tests are necessary to diagnose the tumor and define the extent of disease. Tests that your veterinarian may wish to perform include:
Treatment of Hemangiosarcoma of the Bone in Cats
Treatment may include the following:
Home Care and Prevention
Your veterinarian will most likely prescribe pain medication to ensure your pet’s comfort. These medications may be given prior to definitive diagnosis and/or after surgery. Medication will usually be in the form of pills or narcotic pain patches that are placed on the skin to release a constant level of medication across the skin.
You should limit your cat’s activity to minimize pain and to prevent what is called a pathologic fracture, which is an abnormal breaking of the bone due to the cancer weakening the bone. Your pet should not run, jump or play during this time. You should watch your cat carefully and give assistance when he climbs stairs.
Have your veterinarian evaluate promptly any unexplained bump or lameness that develops. Lameness is more likely to be associated with arthritis or injury to ligaments and tendons than cancer, but it is worth having your cat evaluated nonetheless.
If your cat does not improve with rest or anti-inflammatory drugs, radiographs of the affected part of the body may be indicated to exclude bone cancer as a cause of the lameness or pain.
Hemangiosarcoma, like other cancers, is not currently preventable.
In-depth Information on Hemangiosarcoma of the Bone in Cats
Hemangiosarcoma is a type of cancer that most commonly affects the spleen, liver and heart and typically causes bleeding from the ruptured tumor. Although it can arise in bone initially, this is rare. Most often when it occurs in bone, the tumor has spread there from another site in the body. Thus, if your cat is diagnosed with bone hemangiosarcoma it is vitally important that other more common sites of this tumor are excluded as the primary site.
As with most forms of cancer, very little is known about what causes hemangiosarcoma to develop. It is a highly lethal form of cancer and thus the diagnosis and treatment should be prompt and aggressive.
Related Symptoms or Diseases
It is important to distinguish tumors that have spread from other tissues to bone from those that arise in bone initially because the treatment differs. For metastatic tumors an attempt is made to determine the site of the primary cancer. If your pet is diagnosed with cancer, your veterinarian may wish to consult with an oncologist or cancer specialist to understand the specific behavior and treatment of the cancer.