Kazutaka Ota, Dik Heg, Michio Hori, and Masanori Kohda Department of Biology and Geosciences, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan, Department of Zoology, Graduate School of Sciences, Kyoto University, KitashirakawaOiwake, Sakyo, Kyoto, 606-8502, Japan, and Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Wohlenstra...

A rare case of choroidal malignant melanoma in a naevus of Ota is described. This is the first reported case from Asia outside the Japanese population. This case illustrates the need for close observation of all pigmented lesions of the eye.