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What Is Malignant Melanoma of the Eye?

Malignant melanoma of the eye is a cancer that arises from pigment producing melanocytes in structures such as the iris, ciliary body, choroid, or conjunctiva. Uveal melanoma, which involves the iris, ciliary body, or choroid, is the most common primary intraocular malignancy in adults. These tumors can grow locally inside the eye and sometimes spread to distant organs, especially the liver. Symptoms range from no complaints at first to blurred vision, floaters, or visual field defects as the tumor enlarges. Early detection helps protect both sight and general health.

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What Is Malignant Melanoma of the Eye?

Malignant melanoma of the eye is a cancer that arises from pigment producing melanocytes in structures such as the iris, ciliary body, choroid, or conjunctiva. Uveal melanoma, which involves the iris, ciliary body, or choroid, is the most common primary intraocular malignancy in adults. These tumors can grow locally inside the eye and sometimes spread to distant organs, especially the liver. Symptoms range from no complaints at first to blurred vision, floaters, or visual field defects as the tumor enlarges. Early detection helps protect both sight and general health.

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Types and Risk Factors

Most ocular melanomas develop in the uveal tract, particularly the choroid, while a smaller number arise in the conjunctiva or iris. Risk factors include light skin, light eye color, and exposure to ultraviolet light, although many patients have no clear triggers. Certain inherited syndromes and atypical cutaneous nevi patterns add risk. Iris and conjunctival melanomas often present earlier because they are more visible, while choroidal tumors may stay hidden until symptoms appear or are found on routine exam. Tumor size, location, and cell type influence behavior and prognosis.

Symptoms and Clinical Features

Some people notice blurred or distorted vision, flashes, floaters, or a shadow in part of the visual field. Others have no symptoms and the tumor is discovered during a dilated eye exam. On fundus examination, choroidal melanomas often appear as elevated, pigmented or occasionally amelanotic masses with associated subretinal fluid or orange pigment. Iris tumors may appear as new dark nodules or areas of diffuse pigmentation with sectoral cataract or glaucoma. Conjunctival melanomas present as pigmented or nonpigmented lesions on the ocular surface, sometimes arising from pre existing nevi or primary acquired melanosis.

How Is Malignant Melanoma of the Eye Diagnosed?

Diagnosis relies on a detailed dilated exam combined with ocular imaging. Ultrasound helps measure tumor thickness and internal reflectivity, while optical coherence tomography documents associated retinal changes and subretinal fluid. Fluorescein or indocyanine green angiography and fundus photography record vascular patterns and growth over time. In many cases, clinical and imaging features are characteristic enough that biopsy is not needed. Systemic workup, especially liver imaging and blood tests, checks for metastatic disease at baseline and during follow up.

How Is Malignant Melanoma of the Eye Managed?

Treatment depends on tumor size, location, and overall health. Options include plaque radiotherapy, proton beam radiotherapy, local resection, or, for very large or painful eyes, enucleation. Small lesions suspected of being early melanomas or suspicious nevi may be monitored closely before intervention. After local treatment, regular systemic surveillance is important to watch for metastasis, particularly to the liver. Low vision support and counseling help patients adjust if central vision is affected or if an eye must be removed.

FAQs About Malignant Melanoma of the Eye

Is ocular melanoma related to skin melanoma?

Both arise from melanocytes and share some risk factors, but many eye melanomas occur without a history of skin melanoma. People with atypical skin nevi patterns are followed carefully for both.

Can a benign nevus in the eye turn into melanoma?

Most choroidal and iris nevi stay benign, but a small number show growth and other changes that suggest transformation. Regular monitoring helps detect worrisome features early.

Does treatment for ocular melanoma always involve removing the eye?

No. Many tumors are treated with plaque or proton radiotherapy that preserves the eye, although some vision loss can still occur. Enucleation is reserved for large, painful, or poorly controlled tumors.

How often will I need follow up after treatment?

Patients usually have lifelong follow up with periodic eye exams and systemic surveillance, especially liver imaging, so that any recurrence or spread can be detected as early as possible.