On FA, how do type 1 occult CNV Fibrovascular PEDs present?

Type 1 occult choroidal neovascularization (CNV) associated with fibrovascular pigment epithelial detachments (PEDs) typically presents on fluorescein angiography (FA) with late leakage and/or staining. This is due to the increased vascularity in the region of the CNV.

In these cases, the CNV is often located beneath the retinal pigment epithelium, which makes its detection more subtle compared to other types. Initially, you may not see significant hypo-fluorescence; however, as the FA progresses, the presence of leakage becomes more pronounced in the later phases. This leakage indicates the pathophysiological activity of the neovascularization underneath the retinal pigment epithelium.

The other options describe different scenarios that do not align with the typical behavior of type 1 occult CNV. For instance, early hypo-fluorescence would suggest a lack of vascularity or fluid accumulation, which is not characteristic of these lesions. Consistent fluorescence with no leakage would indicate non-active disease or a normal state rather than the presence of a fibrovascular PED and associated CNV.