Ventriculomegaly with cystic kidney disease (VMCKD) is a novel syndrome characterized by greatly elevated maternal serum alpha-fetoprotein and/or amniotic fluid alpha-fetoprotein levels, cerebral ventriculomegaly and renal findings similar to Finnish congenital nephrosis [DS: H01657]. All reported patients have been homozygotes or compound heterozygotes for sequence variants in the CRB2 genes. CRB2 encodes a transmembrane protein that is predominantly expressed in human fetal eye, retinal pigment epithelium/choroid, brain, and kidney.