Fetal magnetic resonance imaging findings of Dandy-Walker malformation in monochorionic dlamniotic twins

摘要

Fetal magnetic resonance imaging (MRI) findings of Dandy-Walker malformation are presented in twins at 22 weeks of gestation. The mother was 22 years-old. Prenatal ultrasonography at 18 weeks revealed mega cisterna magna in one fetus and a borderline cisterna magna in the other fetus of monochorionic diamniotic twins. Fetal MRI findings were consistent with Dandy-Walker Syndrome in one and Dandy-Walker variant in the other fetus. Dandy-Walker malformation affecting both fetuses of the twins is extremely rare. Although ultrasonography is the primary modality for the diagnosis, fetal MRI is an important tool to confirm the diagnosis, to describe the anatomic features in detail and to identify associated anomalies.