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In page Central serous chorioretinopathy:
"Different stages of the pachychoroid are defined depending on the amount of cumulative damage.[1][2] If there are defects in the retinal pigment epithelium without accumulation of fluid below the retina, a pachychoroid pigment epitheliopathy (PPE) is present. Accumulation of fluid results in central serous chorioretinopathy (CSC). The development of secondary blood vessels, so-called choroidal neovascularization (CNV) leads to pachychoroid neovasculopathy (PNV). If parts of these new vessels bulge outward, so-called aneurysms develop within this CNV, defining pachychoroid aneurysmal type 1 CNV (or, still widely used, polypoidal choroidal vasculopathy (PCV)).[citation needed]
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