This 74YO female has a large complex disciform scar from end-stage age-related macular degeneration (AMD).
A very prominent retinal vein drains directly into the substance of the scar inferiorly, indicating a chorioretinal anastomosis. Fluorescein angiography shows diffuse staining of the subretinal scarring.
Learning Points:
Under normal conditions, the retinal and choroidal circulations remain separate and distinct. Rarely, the two circulations connect directly through a chorioretinal anastomosis.
These can occur in chorioretinal scars (typically from inactive toxoplasmosis lesions), in macular telangiectasia, and in disciform scars.
