title: Occult foreign body simulating a choroidal melanoma with extrascleral extension.
abstract: A 62-year-old man was noted on routine examination to have a dark lesion in the peripheral fundus of the right eye and a corresponding dark scleral mass. The lesion was initially suspected to be a choroidal melanoma with extrascleral extension. The patient denied having ocular trauma. Orbital x-rays and ultrasonography, however, demonstrated the lesion to be an occult transcleral metallic foreign body. An occult foreign body should be considered in the differential diagnosis of a small choroidal or ciliary body melanoma with extrascleral extension.
mesh_terms: D002830:Choroid Neoplasms / Q000175:diagnosis* / Q000473:pathology; D005129:Eye Foreign Bodies / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology; D008670:Metals; D008875:Middle Aged; D012590:Sclera / Q000473:pathology*; D014463:Ultrasonography
chemical_list: D008670:Metals