juxtapapillary choroidal melanomaamelanotic choroidal melanomachoroidal malignant melanomachoroidal melanoma metastasischoroidal melanoma diagnosischoroidal melanoma prognosisocular choroidal melanomachoroidal melanoma stagingchoroidal melanoma liverchoroidal melanoma imageschoroidal nevus melanomamelanoma choroidal eye