Pigmented Conjunctival Cancers (Primary Acquired Melanosis) New York Eye Cancer Center Iris melanocytic tumors are a group of pigmented or non pigmented lesions arising from melanocytes in the iris. These can range from benign to malignant. Suspicious features for melanoma (ABCDE of Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports Neurocutaneous melanosis with an intracranial cystic solid meningeal melanoma in an adult: A case report and review of literature