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A vasoproliferative condition of the retina seen in very immature newborn infants. Stage 4 is defined by subtotal retinal detachment. The 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. Stage 4A is defined by retinal detachment which spares the macula. Stage 4B is defined by retinal detachment involving the macula.
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