Fibrosarcoma in Cats
There are four very distinctive symptoms that you can watch for

Fibrosarcoma in cats can spread so rapidly and viciously that the only way it may be stopped is by amputation if this growth has grown large enough and cannot be effectively removed by surgery.

Up until recently, this form of cancer has been relatively rare in cats, but it seems to be occurring much more frequently and can affect your cat’s bones or their mouth.

However, it usually attacks the legs.

The actual cause is still unknown, but there is a growing concern in the medical community that it is the result of a recent vaccination as cats almost always develop this growth at the site of the vaccination.


Fibrosarcoma in cats is a form of cancer that develops from the fibrous connective tissues in your cat and can develop in any type of bone.

However, it seems to be a lot more prone at affecting the skull, spine, pelvis, or your cat’s legs.

It can also develop in the mouth.

Since this growth has been so rare in the past, it has often been confused with osteosarcomas.

These are also cancerous bone tumors that usually develop in your cats bones during the growth stages.

It is very rare for any type of cancer to spread from one part of the body and then cause a bone cancer, but it can occur with mammary gland cancer as well as prostrate or urinary bladder cancer.

However, since it is so rare, it is very important to watch for the symptoms to develop in this very dangerous type of cancer that could result in an amputation in an attempt to save your cats life.


There are four very distinctive symptoms that you can watch for that your pet may be developing Fibrosarcoma in cats.

In most cases, they will all generally occur within three to four weeks after a vaccination.

Cats blue eyesIf your cat suddenly becomes lame they may have this dangerous disease

Any type of swelling in your cats bones that has suddenly developed is the first warning sign which could be followed by a difficulty in swallowing or eating.

Bleeding from your cat’s mouth, as well as a very sudden development of an extreme breath odor, is another warning sign.

However, by far and away the largest warning sign is any type of a sudden lameness or pain that has developed for no known reason in your cats legs.


Lameness in your cat is a sign of Fibrosarcoma in cats that must be taken very seriously as it is generally indicates arthritis, but that develops over time and you will see the symptoms start very slowly.

It could also be the result of a tendon tear, a ligament problem, or even a cartilage problem, but in most cases there is a cause that can be identified.

But if develops suddenly, for no known reason and your cat has recently been vaccinated, you need to seek immediate veterinary advise as the longer you wait the more it can spread.

Fibrosarcoma in cats can also cause your cats bones, especially their leg bones, to fracture very easily.

Fractured bones are the result of some type of a traumatic event that your cat has suffered, but there is a condition known as pathologic fractures that can occur with just the slightest of an injury.

A pathologic fracture is a situation where your cat’s bones have become extremely weak by some type of a disease, and as a result they will fracture or break very easily.

Again, if this occurs in your cat and they have recently been vaccinated, something may be terribly wrong with your pet.


Fibrosarcoma in cats is a very difficult form of cancer to treat, simply because it involves soft tissues in your cat.

Your veterinarian will have to surgically remove not only the tumor itself, but also a large mass of healthy tissue that surrounds the tumor to ensure that there is no cancer cells missed.

If a cancer cell is missed, the tumor can come back in as little as two to three months as strong, if not stronger.

Here is where the tough decisions for an owner will have to be made in some cases.

Fibrosarcoma in cats generally affects the leg or legs, and there is not a lot of soft tissue to work with.

The only way your veterinarian may successfully get all of the cancer cells is by amputation.

If not, it will spread very rapidly and your cat will not survive for much longer.

The next form of treatment is controversial and your veterinarian may not recommend it, but a second veterinarian may indicate it is the only viable chance your cat has of surviving, even after the surgery with or without amputation.

With this form of cancer, you should get a second opinion, but that will be your call.

Radiation therapy is a process where a beam of radiation is directed at your cats tumor in an attempt to relieve the pain and is a highly specialized form of treatment and fairly expensive.

Many veterinarians will only use this treatment if your cat has a pre-existing condition that will not allow for surgery.

However, there are other veterinarians that will suggest that since re-occurrence is common and a condition where the cancer may appear even with surgery, Fibrosarcoma in cats should also be treated with radiation.

But even this is controversial, as some medical professionals will suggest that if it is done prior to surgery, it reduces the size of the tumors.

However others may suggest radiation after the surgery to kill off any remaining cancer cells.

Both have advantages and disadvantages, and you should visit with your veterinarian to get all of the answers.

The advantages of doing it prior to surgery is in reducing the tumors size and as a result decrease the possible spread of cancer cells.

The disadvantages are that it can increase the risk of complications during surgery.

The advantages of performing radiation therapy after surgery are that it may control the tumor better simply because individual cells are much easier to kill than a mass of cells.

The disadvantages are that surgery may increase the size of the area that needs to be radiated.


Fibrosarcoma in cats was once a very rare form of cancer, but it is becoming a lot more common.

There are still no medical facts that point to a certain type of vaccination or a certain brand or manufacturer that may be the cause.

But what is widely accepted is that it almost always occurs after a vaccination.

Watching for any signs of lameness or fractured bones in the three to six week window after may save your cats life in the long run.

At the lest you may catch this wicked cancer very early before amputation is the only resort.

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