Retinopathy of prematurity, Stage 4 (Q94882)

Stage 4: Partial Retinal Detachment: Stage 4, in the initial classification was the final stage and initially known as the cicatricial phase. It was later divided into extrafoveal (stage 4A) and foveal (stage 4B) partial retinal detachments. Stage 4 retinal detachments are generally concave and most are circumferentially oriented. Retinal detachments usually begin at the point of fibrovascular attachment to the vascularized retina and the extent of detachment depends on the amount of neovascularization present.