·Arnold- Chiari malformation- Between 80 and 90% seen as an abnormal banana shaped cerebellum or absent cerebellum.
Arnold- Chiari malformation
·Ventriculomegaly- 75% of cases of spina bifida demonstrate this abnormality
·Lemon shaped head- seen in 90-95% of fetuses.
·Abnormal spine- the majority (63%) occur in the lumbosacral region where there abnormally wide and divergent lateral masses are evident. There may be skin covering or just thing membrane. Open – 80%; closed- 20%.