Objective: We assessed the clinical characteristics and perinatal outcome of disorders specific to monochorionic diamniotic (MD) twin pregnancies, focusing on twin-twin transfusion syndrome (TTTS) and related disorders, such as selective intrauterine growth restriction (sIUGR), inter-twin amniotic fluid discordance (AFD), and twin anemia polycythemia sequence (TAPS).
Methods: We retrospectively reviewed 69 cases of MD twin pregnancies delivered after 22 weeks at our institution from January 2009 to September 2013.
Results: TTTS occurred in 9 cases (13%). There was a total of 11 cases (16%) of MD twins with sIUGR in this period. One case developed TTTS. All 3 cases (4%) of AFD in this study developed TTTS or sIUGR.
Conclusion: AFD should be recognized as predictors of TTTS or sIUGR. Further studies on TTTS-related disorders allow a more precise subgroup categorization that enables optimal management.
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