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Yannuzzi classification system of retinal angiomatous proliferation. A, Stage I: intraretinal neovascularization. B, Stage II: subretinal neovascularization with a retinal-retinal anastomosis. C, Stage II: subretinal neovascularization with a serous pigment epithelial detachment. D, Stage III: choroidal neovascularization with a vascularized pigment epithelial detachment and a retinal-choroidal anastomosis.6
