Discordant retinopathy of prematurity in twin anemia-polycythemia sequence.

We report the case of severe retinopathy of prematurity (ROP) in the donor twin with twin anemia-polycythemia sequence managed with the novel treatment of intrauterine blood transfusions. The fellow polycythemic twin was managed with intrauterine venesection and developed only mild ROP. Thus, despite intrauterine improvement of the twins' hemodynamic conditions, the risk of developing severe ROP remained in the donor twin.