OP03.09: Fetal ventricular size as a predictor of intervention for postnatal hydrocephalus in open spina bifida. Issue Volume 58:Issue S1(2021)Supplement (14th October 2021) - Agrawal, S.; Al‐Refai, A.; Abbasi, N.; Kulkarni, A.; Drake, J.; Ryan, G.; van Mieghem, T.