Fig 3.

A 7-year-old boy with a complete aqueductal stenosis and hydrocephalus (patient 1). A, Axial FLAIR image shows a compensated hydrocephalus. B, Sagittal thin-section T1-weighted image demonstrates a narrowed distal aqueduct and a prestenotic aqueductal dilation (arrow). C, Sagittal 3D-SPACE with VFAM MR image shows a restricted hyperintense CSF flow proximal to the stenotic segment, whereas the unrestricted flow of CSF distal to the stenosis appears hypointense (arrow). Sagittal (D and E) and axial (F) PC-MRI shows a complete aqueductal stenosis, consistent with 3D-SPACE images.