Malignant melanoma of the choroid in a case of naevus of ota.

A PATIENT is presented in whom a malignant melanoma of the choroid developed in association with a naevus of Ota. The naevus of Ota is quite common in Orientals but occurs far less frequently in Caucasians and Negroes. It is considered an aberrant or misplaced mongolian spot and it rarely undergoes malignant change. Apart from its rarity, malignant change has never been recorded in Orientals and there are only a few reported cases of such a change in Caucasians; in the choroid (Hulke, 1861; Albert and Scheie, 1963; Tosti and Renna, 1966; Makley and King, 1967; Volpi, 1966; Roy and Schaeffer, 1967), in the skin (Dorsey and Montgomery, 1954), in the orbit (possible cases-Benedict, 1949; Reese, 1964; well documented cases-Jay, 1965; Hagler and Brown, 1966), in the iris (Font, Reynolds, and Zimmerman, 1967), and in the brain (Willis, 1960; Gomez Gonzales, Roselli, and Rodriguez, 1965). Case Report A 57-year-old white man complained of impaired vision in the left eye and was referred to the University Eye Clinic in June, 1967.