Fig. 3

Nine-image template after 5D CNS+™ application depicting abnormal CNS anatomy of a dichorial twin gestation at 18 completed weeks. The transthalamic plane (TT; acquisition plane) shows enlarged lateral ventricles (LV) and a fluid-filled area (*) in the midline (also seen in the sagittal and transventricular (TV) cutting sections), most likely representing a dilated suprapineal recessus. Turricephaly was clearly displayed in the sagittal planes. The aqueduct of Sylvius cannot be distinguished in either the sagittal or transcerebellar plane (TC), which accomplishes the clinical picture of an obstructed liquor circulation. The transverse diameter of the cerebellum is small, suggesting severe hypoplasia and fusion of the hemispheres, as found in rhombencephalosynapsis (RES; solid arrow). The coronal transthalamic plane (TTc) reveals thalamic fusion (dotted arrow)