[Congenital pit of the optic disk in indocyanine green]

Etiopathogeny of serous retinal detachment (SRD) in optic pits remains a mystery. Several hypotheses have been proposed that lead to different treatments based on the possible mechanisms which explain the occurrence of SRD. The literature data about fluorescein angiography mainly concern the angiographic aspects of the optic pit itself, and seldom the SRD. We have examined these fluorescein angiographic aspects of the SRD. Indocyanine cardiogreen video-angiography gives new information which question the last etiologic hypothesis.

Nine patients underwent a fluorescein angiography when the SRD was discovered. Indocyanine cardiogreen was performed in four patients.

In 8 cases there was hyperfluorescence on the optic pit. In 7 cases in the peripapillar space of the SRD. In one of these cases, there was a leakage on the temporal margin of the optic nerve. In 8 cases in the SRD: we noticed a late minimal hyperfluorescence in the SRD but it already existed in the early angiogram. The SRD became hyperfluorescent in arterio-veinous retinal phase. In late phases we noticed a well-demarcated area of hyperfluorescence.

These investigations have revealed a permeation problem on the blood-outer retinal barrier of the peripapillar space and above all from the edge of optic pit. This can have a prognosis value for SRD. The hyperfluorescence in SRD remains an enigma and does not allow, as we thought before, to confirm one of the etiopathogenic hypotheses. A better acknowledge of indocyane cardiogreen angiographic semiology will allow us to explain these aspects in the future.