We report a metastatic cutaneous melanoma of the medial rectus muscle of the right orbit which presented with diplopia, exophthalmos and retrobulbar pain. Radioimmunoscintigraphy using melanoma-specific monoclonal antibody was used to confirm the diagnosis and to show the presence of disseminated disease in other areas. Effective palliation was achieved with external beam irradiation.
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Patel et al. (1991) studied this question.