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What Is Conjunctival Melanoma?

Conjunctival melanoma is a malignant tumor that arises from pigment producing cells on the eye's surface. It can develop from primary acquired melanosis with atypia, a preexisting nevus, or appear de novo. Lesions often present as raised, variably pigmented masses with feeder vessels on the bulbar conjunctiva, limbus, or caruncle. Tumor cells can invade locally and spread to regional lymph nodes or distant organs. Early recognition and careful staging guide treatment and long term surveillance.

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What Is Conjunctival Melanoma?

Conjunctival melanoma is a malignant tumor that arises from pigment producing cells on the eye's surface. It can develop from primary acquired melanosis with atypia, a preexisting nevus, or appear de novo. Lesions often present as raised, variably pigmented masses with feeder vessels on the bulbar conjunctiva, limbus, or caruncle. Tumor cells can invade locally and spread to regional lymph nodes or distant organs. Early recognition and careful staging guide treatment and long term surveillance.

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Causes and Risk Factors

Most cases of conjunctival melanoma are linked to primary acquired melanosis with atypia, where abnormal melanocytes gradually transform into malignancy. A smaller portion arise from long standing conjunctival nevi or without a clear precursor. Fair skin, light eye color, and ultraviolet light exposure are considered contributors, similar to other melanocytic tumors. Prior radiation or chronic irritation of the ocular surface has been reported in some patients. Genetic changes such as BRAF or NRAS mutations are found in a subset of tumors.

Clinical Features and Examination

Patients often notice a pigmented spot that enlarges, becomes thicker, or develops new blood vessels. The lesion can have variable color, from tan to dark brown or even amelanotic, and may show nodularity or fixation to underlying tissue. Involvement of the limbus, forniceal conjunctiva, or caruncle is common. On slit lamp exam, prominent feeder vessels and local corneal extension raise concern. Palpation and inspection of regional lymph nodes are part of the initial assessment.

Diagnosis, Staging, and Imaging

Definitive diagnosis relies on histopathologic analysis of excised tissue. Excisional biopsy with tumor handling techniques that reduce seeding risk is preferred when feasible. Pathology reports describe cell type, margin status, depth, and presence of lymphovascular invasion. Imaging such as ultrasound biomicroscopy, orbital MRI, and systemic scans helps stage disease and look for nodal or distant spread. Staging systems incorporate tumor size, location, and metastasis to estimate prognosis.

Treatment and Prognosis

Treatment usually includes wide local excision using a no touch technique, combined with adjunctive cryotherapy to surrounding conjunctiva. Topical chemotherapy agents such as mitomycin C, interferon, or radiotherapy are added in selected cases to reduce recurrence. Sentinel lymph node biopsy is considered for tumors with higher risk features. Long term follow up is essential because local recurrence and metastasis can appear years later. Prognosis depends on tumor thickness, location, and success of initial control.

FAQs About Conjunctival Melanoma

Is conjunctival melanoma the same as a conjunctival nevus?

No, a nevus is a benign pigmented lesion that usually stays stable, while melanoma shows growth, vascularity, and malignant cell features on pathology.

Can conjunctival melanoma spread to the rest of the body?

Yes, tumor cells can travel to regional lymph nodes and distant organs such as the lungs or liver, which is why systemic surveillance is recommended.

Does every pigmented spot on the eye need to be removed?

No, many are benign nevi. Lesions that change in size, color, thickness, or vessels should be evaluated promptly and sometimes biopsied.

Will treatment for conjunctival melanoma affect vision?

Excision near the limbus or cornea can induce scarring or astigmatism, but careful surgical planning aims to control the tumor while preserving useful vision.

References

American Academy of Ophthalmology (AAO). ?Conjunctival Melanoma: Rare but Deadly.? https://www.aao.org/education/current-insight/conjunctival-melanoma-rare-deadly

American Academy of Ophthalmology (AAO). ?Diagnosis and Management of Conjunctival Melanoma.? https://www.aao.org/eyenet/article/diagnosis-management-of-conjunctival-melanoma

EyeWiki (AAO). ?Conjunctival Melanocytic Tumors.? https://eyewiki.org/Conjunctival_Melanocytic_Tumors

Cleveland Clinic. ?Conjunctival Melanoma: Symptoms & Treatment.? https://my.clevelandclinic.org/health/diseases/24895-conjunctival-melanoma

NCBI (PubMed Central). ?Management of conjunctival malignant melanoma: a review and update.? https://pmc.ncbi.nlm.nih.gov/articles/PMC4285629/