Thorough assessment of the fetal central nervous system is required to select the most suitable candidates for fetal spina bifida surgery, and for post-operative monitoring to predict outcome. Children with myelomeningocele exhibit difficulties in cognitive performance, and motor skills1. This is related to the Chari II malformation and ventriculomegaly2,3. Our aim is to determine if MRI technology can quantify volume, surface area, and shape of cerebral structures before and after fetal spina bifida surgery. We explore if these parameters can be used as potential biomarkers for efficacy of fetal surgery by correlating with herniation level.