Figure 2.

Classic Chiari II malformation findings detected by ultrasound in fetuses with open spina bifida: (A) midsagittal view demonstrating a clivus–occipital bone angle of 69°; (B) transcerebellar view showing a ‘banana’ sign of the cerebellum and an effaced cisterna magna; (C) transcerebellar view showing prominent beaking and elongation of the tectum; (D) transventricular view demonstrating the scalloping of the frontal bones of fetal skull, known as the ‘lemon’ sign. Reprinted with permission of the UZ Leuven, Leuven, Belgium.