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| Iris Neoplasms Neoplasms, Iris | Iris Neoplasm | Neoplasm, Iris Tumors of the iris characterized by increased pigmentation of melanocytes. Iris nevi are composed of proliferated melanocytes and are associated with neurofibromatosis and malignant melanoma of the choroid and ciliary body. Malignant melanoma of the iris often originates from preexisting nevi. |