fig 3.

Patient 23: hydrolethalus syndrome with postnatal correlation (39 weeks' gestation).

A, Prenatal axial ssFSE image (∞/97/0.5) at the level of the third ventricle shows calvarial defect and meningocele (arrows).

B, Prenatal sagittal ssFSE image shows vermian hypogenesis, large fourth ventricle, elevated tentorium (Dandy-Walker malformation), and calvarial defects (arrows).

C and D, Postnatal axial (C) and sagittal (D) T2-weighted sequences (3000/120/1 and 3000/102/2, respectively) confirm the prenatal findings, although the meningoceles (arrows) are less apparent due to positional flattening.