marginal cord insertion in dichorionic diamniotic twin and one had umbilical veinous varix were resulting in elective Caesarean section due to fetal growth restriction.Remaining a case with hypercoiled cord was required emergency Caesarean section due to severe bradycardia at 30 weeks of gestation.Regarding to histological evaluation of the umbilical cord, obstructive type was observed a half of cSUA and 31% (5/16) of iSUA.Regardless isolated or not, acute non-reassuring fetal distress was associated with complicating cases with the other placental and umbilical cord abnormalities.Conclusions: Prognosis of cSUA seemed to be depended on complication itself, whereas prognosis of iSUA without any complication in placenta and umbilical cord would be favourable.When SUA complicates with any placental and umbilical cord abnormality, follow-up management of ultrasound and CTG to detect fetal growth restriction and non-reassuring fetal status are required.