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Melanocytoma

This is a rare, deeply pigmented, tumour, which is usually found at the optic disc, but which can occur anywhere in the uveal treact, including the iris.

 

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Small optic disc melanocytoma

 

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Large optic disc melanocytoma

 

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Small ciliary body melanocytoma (biopsy proven)

 

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Ciliary body melanocytoma invading anterior chamber

 

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Iris melanocytoma

 

At the optic disc, the tumour can compress the optic nerve fibres to cause loss of vision.This can occur acutely if the tumour undergoes necrosis (i.e., dies and swells).

 

In the ciliary body and iris, necrotic melanocytoma can cause uveitis (i.e., inflammation) and pigment scatter.

 

Malignant transformation to melanoma can rarely occur. Life-long surveillance is therefore required.