OC01.03: Low torcular Herophili position and large brain stem: tentorium angle in fetuses with open spinal dysraphism at 11–13 weeks of gestation. Issue Volume 58:Issue S1(2021)Supplement (14th October 2021) - Fanelli, T.; Boito, S.M.; Volpe, G.; Olivieri, C.; Tamborrino, V.; Persico, N.; Volpe, P.; Chaoui, R.