Amniotic band syndrome in a monochorionic diamniotic twin pregnancy after rupture of the dividing membrane in the early second trimester: A case report

摘要

Fetal ultrasonography. a Transvaginal ultrasonography at 8 weeks of gestation. The lack of the “twin peak” sign, also called the lambda sign (arrow), indicates an MCDA twin pregnancy. b Transabdominal fetal ultrasonography at 15 weeks of gestation. There is no evidence of a dividing membrane. c Transabdominal three-dimensional ultrasonography at 18 weeks of gestation. Baby B has a swollen upper left arm (arrows), and part of the amniotic membrane (arrowheads) is attached to this arm. L legs of baby A, P placenta. d Transabdominal two-dimensional ultrasonography at 18 weeks of gestation. Baby B has a swollen upper left arm (arrows)