Fig. 7
From: Non-visualisation of cavum septi pellucidi: implication in prenatal diagnosis?
Severe chronic hydrocephalus: aqueductal stenosis. a Occipito-bregmatic ultrasound view at 23 weeks demonstrates non-visualisation of the CSP and moderate but non-specific bilateral symmetric ventriculomegaly of the lateral ventricles. b Axial ultrasound at 29 weeks demonstrates progression in ventriculomegaly and macrocephaly. c Axial T2-weighted MRI at 30 weeks’ gestation demonstrates absent CSP, enlargement of the third ventricle (arrow) and bilateral lateral ventricles with colpocephaly (asterisk). d Sagittal T2-weighted MRI demonstrates lack of visualisation of a fluid-filled aqueduct of Sylvius (arrow), suspicious for stenosis. Postnatal MRI following decompression of the ventricular system confirmed aqueductal stenosis