Abnormal macular morphology Choroidal neovascularization 2012-04-06T09:28:46Z Choroidal neovascularization can be extrafoveal, subfoveal, or juxtafoveal. Choroidal neovascularization (CNV) is the inward growth of new blood vessels arising from the choriocapillaris. Depending on the stage of development, they can be external (type 1 NV) or internal (type 2 NV) to the retinal pigment epithelium. Choroidal neovascular membrane HP:0011506 UMLS:C4023323 Abnormal morphology of the choroidal vasculature