RecruitingDevice studyA Phase II Trial of Fetal Embolization for Vein of Galen MalformationThis is a prospective, single-arm non-randomized interventional study of fetuses to assess the efficacy and safety of fetal embolization of VOGM. Subjects will receive a one-time study intervention of fetal embolization, at or after 34 weeks of gestation. After delivery, neurological assessments will be performed every 6 months for 2 years (adjusted for gestational age). Data will be compared to historical cohorts.