Detection of digynic triploidy in a second-trimester fetus presenting syndactyly, relative macrocephaly, intrauterine growth restriction, cardiomegaly, pericardial effusion, Dandy-Walker malformation, double bubble sign and single umbilical artery on prenatal ultrasound and a false negative non-invasive prenatal testing result in the first trimester.

Competing Interests: Declaration of competing interest The authors have no conflicts of interest relevant to this article.