Detection of twin reversed arterial perfusion sequence at the time of first ultrasound screening and its spontaneous resolution. A case report

Since monochorionic twins share the same placenta, there is the possibility of the development of placental anastomoses and communication between the fetuses. The extreme form of this anastomosis is the twin reversed arterial perfusion sequence (TRAPs). Some authors believe that prophylactic cord occlusion should be offered to all pregnancies of TRAPs. However exact criteria to deciding whether and when intervene have not been defined and it is not a procedure without complications. Anyway a spontaneous resolution is possible, even if rare. Here we present one of these cases of TRAPs with a good outcome without treatment. Weekly ultrasound is useful for the monitoring of TRAPs pregnancy to avoid intervention because spontaneous resolution is possible, as demonstrated in our experience.