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