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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Third eyelid masses in cats are usually cancerous. The most common type of cancer is Lymphoma, as the tissue is heavy in lymphatics.
The good thing about Lymphoma, is that it's very responsive to chemo and steroids in cats. I would probably do a wedge biopsy to be sure. This is where a wedge of tissue is taken and biopsied. I would probably start the steroids (Prednisolone) while the biopsy is being run. If it's Lymphoma, you do not have to remove the eye (enucleate). If it's some other type of glandular tumor (adenocarcinoma), then enucleation is the next step to remove as much cancerous tissue as possible.
I hope this helps, let me know if you have any other questions.
Hey, sorry for the wait. I was pretty busy in the ER all day and didn't get a chance to get back online.
If it's a squamous cell carcinoma, then the treatment is surgical removal of the eye and surrounding tissue. Sometimes we can get a surgical cure, but more often than not it will recur in a nearby area (globe, jaw, mouth).
Pred is used less commonly for squamous cell carcinomas.