. Isolated occult choroidal neovascularization: comparison between early and late phases of ICGangiography

摘要

Indocyanine (ICG) angiography is shown to be helpful in identifying choroidal new vessels when occult on fluorescein angiography. Isolated occult choroidal neovascularization (CNV) or leakage of undetermined source (type II of the MPS classification) are not associated with serous haemorrhagic, or fibrovascular pigment epithelium detachment. On early phase ICG angiography, occult CNV may be converted into a well-defined net in about 40% of cases. This conversion allows a good delination and definition of the limits of the neovascular complex. This early net is more often identified using scanning laser ophthalmoscope technology while using infrared fundus cameras. The identification of isolated occult CNV is based on the visualization in the late phases of hyperfluorescent plaque with hyperfiuorescence. The signification of this late staining plaque is still controversial.To approach and to analyse the meaning of the late staining plaque, an overlay of the early net on the late staining plaque was obtained on ICG angiograms.