Tumors of the Anterior Uvea (Iris and Ciliary Body) in Cats - Page 2

My Pet: FREE Tools to Care for Your Pet and Connect with Others

Over 10,000 Vet Approved Articles Search All Articles

Tumors of the Anterior Uvea (Iris and Ciliary Body) in Cats

By: Dr. Noelle McNabb

Read By: Pet Lovers
Email To A Friend Print
The most common primary anterior uveal tumors include melanoma of the iris and ciliary body, and adenomas or adenocarcinomas of the ciliary body.

Melanomas are the most common primary uveal tumor. Cats most commonly develop a diffuse, flat melanoma of the iris that begins as progressive pigmentation (darkening) of the surface of the iris. This color change is often a slow process and may develop over several months to years. Several golden-brown pigmented spots or "freckles" may develop simultaneously on the iris that progressively enlarge, grow together and become irregular along their surfaces. The migration of cancerous pigmented cells (melanocytes) into the iris eventually causes the iris to thicken and the shape of the pupil may become distorted. The pupil often remains larger than the opposite normal pupil. Glaucoma may also develop.

Some melanomas lack the typical brown/black pigmentation and are pink/white in color. These are called amelanotic melanomas. All amelanotic melanomas are considered malignant.

All anterior uveal melanomas have malignant potential. Metastatic disease related to uveal melanoma is more commonly observed in the cat than in the dog. Metastasis may occur as late as one to three years after eye removal and usually involves the lymph nodes, lungs and liver.

Primary sarcomas of the eye may develop in cats months to years after an event of ocular trauma or injury. These tumors are highly malignant and necessitate immediate removal of the eye.

The most common secondary anterior uveal tumor is lymphosarcoma. Usually the lymphosarcoma in the eye is one component of widespread cancer throughout the body. It is rare for lymphosarcoma to appear in the eye alone. Other uveal tumors represent the spread of malignant tumors from some other location in the body, such as breast cancer, cancer of the kidney or cancer of the thyroid. Metastasis to the anterior uvea from any kind of malignant tumor is possible, although most metastatic tumors appear in the choroid rather than in the anterior uvea.

A few other ophthalmic diseases or conditions can mimic the symptoms similar to those observed with anterior uveal tumors. It is important to exclude these conditions before establishing a conclusive diagnosis.

  • Severe uveitis
  • Traumatic injuries to the eye
  • Chronic anterior uveitis with hyperpigmentation of the iris
  • Iris cysts
  • Glaucoma
  • Conjunctival and scleral tumors
  • Conjunctival and scleral inflammatory masses that look like tumors
  • Old bleeding into the anterior chamber of the eye

  • Comment & Share
    Email To A Friend Print
    Keep reading! This article has multiple pages.

    Cat Photos Enjoy hundreds of beautiful cat photos Let's Be Friends Follow Us On Facebook Follow Us On twitter


    Email to a Friend

    Article to eMail
    Tumors of the Anterior Uvea (Iris and Ciliary Body) in Cats

    My Pet
    Coming Soon

    Tools to Care for Your Pet and
    Connect with Others!

    Be the First to Know.
    Notify Me