Prenatal diagnosis of Meckel-Gruber syndrome and Dandy-Walker malformation in four consecutive affected siblings, with the fourth one being diagnosed prenatally at 22 weeks of gestation

We report a 23-week-old male fetus affected by Meckel-Gruber syndrome. Posterior encephalocele, post-axial polydactyly, and Dandy-Walker malformation were observed on ultrasonographic (USG) examination at 22 weeks' gestation, and lobar holoprosencephaly was demonstrated on postmortem magnetic resonance imaging (MRI) prior to autopsy. After the termination of the pregnancy, polycystic dysplastic kidneys were also noted at postmortem investigation. The proband was the product of the fourth pregnancy of a consanguineous family in which all three siblings were also similarly affected. Interestingly, both the two-year-old affected sister and 23-week-old male fetus had Dandy-Walker complex.