What is Tumor of the Eye?
Tumor of the eye in cats is a general term that can refer to a large variety of malignant (cancerous) or benign (non-cancerous) tumors or growths in various areas of the eye of your cat. The most common types of tumors of the eye in cats are called melanocytic eye tumors which can progress to uveal melanoma. Melanoma occurs when melanocytes, or darkly pigmented cells, grow uncontrollably.
Symptoms of Tumor of the Eye in Cats
Depending on the type and size of tumor, and other varying factors, there could be a large range of symptoms of tumors of the eye in your cat. Below are a few symptoms of the most common conditions that cause tumors of the eye:
- Discoloration of the iris caused by melanoma
- Cloudy or dark portions of the eye
- Change in iris shape
- High pressure in the eye, also called glaucoma
- Inflammation of the eye
- Irregular discharge in the eye
Tumors of the eye in cats can take two different forms, malignant (cancerous) or non-malignant/benign. The symptoms for each of these main types of eye tumors will begin similarly, but often diverge as the disease progresses.
In malignant, or cancerous, tumors of the eyes in cats, you will see the same loss of vision and other symptoms of benign eye tumors, but with rapidly increasing frequency and severity. Treatment for malignant tumors will also be different, as there will be a greater concern for the tumor spreading, or metastasizing.
Benign, or non-cancerous, tumors of the eye will have a tendency to be slower growing and do not spread to other areas. While the tumor will still need to be treated in order to resolve the related symptoms, there is less concern for the long term prognosis of your cat’s condition if the tumor is treated or removed.
Causes of Tumor of the Eye in Cats
Like most cancers, growths, or tumors, the cause for tumors of the eye in cats is currently unknown. Many developmental or environmental factors may cause melanoma in humans. It is assumed that these conditions operate the same way in our feline companions.
Diagnosis of Tumor of the Eye in Cats
As with most serious medical conditions, any diagnosis of tumors of the eye in your cat will begin with a thorough physical examination. Checking the overall health of your cat will help the veterinarian determine if any tumor has spread or if there are additional diseases contributing to the underlying condition.
Tumors of the eye in cats can be easily identified with an eye exam using an ophthalmoscope. Ophthalmoscopes work the same way for felines as they do for humans, directing light and using microscopic technology to help the veterinarian see the interior of the eye. Your vet will be able to easily identify any tumors of the eye in your cat.
Once a tumor of either kind is diagnosed, the vet will need to determine whether it is cancerous and the full size and specific location of the tumor. This information will be essential to developing an effective treatment plan. Biopsies are the preferred method for diagnosis of tumors of the eye. A very thin needle will be inserted into the tumor area and a small sampling of tissue will be cut and sent to a laboratory, or viewed under a microscope in-house, to determine whether any cancerous cells are present.
Treatment of Tumor of the Eye in Cats
Treatment for a tumor of the eye will depend on many factors. Malignancy, size, location, and current symptoms of the tumor will all affect your veterinarian’s prescribed course of treatment.
In the case of malignant, or cancerous tumors, your veterinarian will often counsel that the entire eye be removed. Regardless of location of the tumor, it is often difficult to excise tumors in their entirety on an area as delicate as the eye. Your vet may suggest removal of the entire eye to prevent the spread of the cancer to other parts of your cat’s body.
Removal of non-cancerous, or very small and isolated cancerous tumors may sometimes be possible using laser or cryotherapy. A laser will use heat to treat and destroy the affected cells, while cryotherapy uses freezing cold temperatures touched to the surface of the cells. The main concern with both of these treatments is in obtaining good margins, or clearing the entire area of the tumor or disease. Additionally, each procedure will have the traditional risks associated with any surgery or procedure requiring sedation via anesthesia.
Recovery of Tumor of the Eye in Cats
Depending on the underlying cause of the tumor, the method of treatment, and accessibility of the tumor, prognosis for your cat affected with tumor of the eyes is very good. In the case of cryotherapy or laser treatment, clean margins or elimination of all affected tumor tissue will create long-term positive outcomes for no reoccurrence of the tumor.
If your cat’s tumor is determined to be malignant, and one eye must be removed, they will have a similarly good rate of recovery. Cats, especially indoor pets that have been thoroughly domesticated, have been shown to survive and thrive with a single eye, and can adapt easily in a household to their changed visual experience.
Tumor of the Eye Questions and Advice from Veterinary Professionals
My cat just turned 8 in February. She has yellow eyes, but about a year and a half ago I noted that she had a small freckle at the 7 o'clock position on her right eye. By last June, the spot had grown, but it still wasn't very large. I noticed around this last Christmas, however, that it was getting much larger and beginning to surround her iris, and as a result her eyes appeared to be two colors. I thought it was some kind of infection, so I took her in to the vet. They looked at her and her eye and came to the conclusion that it is a melanoma of the eye. They did no testing, other than a physical exam and my telling them about the symptoms. They said the only course of treatment is to remove the eye as soon as possible. She has an appointment in 4 days time to have the eye removed. Since we did no blood work or xrays, should I have them do this before we have the surgery just to confirm that it is, in fact, malignant? Or would the same steps be taken if the tumors are benign? I just don't want to do something that can't be undone. Other than that, she is in excellent health.
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My 7 year old cat has bruxism for approx 1.5 years,he has a mitral valve insufficiency noted when he was 2 years old. Still doesnt need any meds. He has a backflow/ or out flow obstruction which is
a loud murmur when he is stressed but diasppears once he is chilled out. Have done various investigations, xrayed head and checked for polyps(none there) dental scale and polish as had gingivits and had 1 tooth removed. Iris melanoma became apparent just less than a year ago and this has progressed slightly but steadily since last July.Decided to find cause of bruxism before considering removal of the eye. CT of head and chest and ultrasound of abdomen have not revealed anything grossly, except that on e of his sinus was absent. Did full mouth dental xrays to make sure not a tooth issue and nothing found. Saw a neurologist who couldn't explain it and suggested a behaviourist and feline medecine vet, who is now reviewing all of his history and trialling opiate based buprenorphine twice daily for a week to make sure not pain related. He had previously tried loxi oral for 2 weeks and gabapentin for a couple of weeks but didnt resolve it. Always associated with being alert and concentrating or after purring. whilst he was coming off the gabapentin did start to use feliway and have seen a bit of difference.After his last GA its developed in to more of a swallow and grind.! Current suggestions are he may have a degree of heart pain because of his backflow, or acid reflux or just plain learned behaviour, none of which helps me in deciding to remove his eye sooner( to prevent spreading) or later or not at all if bruxism is pain related and can't find other cause! Informed his eye is not likely to cause pain or be related to bruxism?
Any insight greatly appreciated!
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Hi our male cat has a large black spot which covers his iris, our vet thought it was an ulcer but after different drops etc thinks it may be a tumour now.He is only 6 yrs of age but is albino and born def also, having to remove his eye and with no hearing what a difficult life for any cat
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Hi, my cat has a small round black dot in the upper corner of her eyeball, right upper eye area. Wondering if we need to take her to the vet to get treated, or examined for anything.
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