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Fatal Umbilical Cord Strangulation in the Remaining Co-Twin after Selective Foeticide with Radiofrequency Ablation for Twin-Twin Transfusion Syndrome.
We report a case of a monochorionic diamniotic twin diagnosed with twin-twin transfusion syndrome (TTTS; stage 3) with co-existing severe cerebral damage in the donor twin at 18 + 4 weeks' gestation. After counselling, the parents opted for selective foeticide of the donor twin. For the procedure, radiofrequency ablation (RFA) was used. Serial ultrasound examinations at 20 + 1 and 21 + 1 weeks' gestation showed good recovery of the ex-recipient, after which the patient was sent back to the referring hospital. At 29 + 5 weeks' gestation, an unexpected foetal death was diagnosed. On macroscopic placental examination, (iatrogenic) monoamnionicity was detected. In addition, the umbilical cord of the recipient was found to be constricted by the macerated umbilical cord of the ex-donor. This case demonstrates that iatrogenic monoamnionicity can be a serious complication of RFA in monochorionic twins complicated by TTTS, with a subsequent risk for cord entanglement leading to a fatal outcome for the remaining co-twin. Although the actual incidence of iatrogenic monoamnionicity after RFA remains unknown, increased attention to the intactness of the inter-twin membrane even weeks after the RFA may be required.
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