Fig 2.

A 35-year-old man with partial aqueductal stenosis (patient 12). A, Sagittal T2-weighted image shows a narrowed aqueduct (arrow). B, Sagittal 3D-SPACE with VFAM image clearly demonstrates a prominent hypointense signal intensity in the cerebral aqueduct (arrow). The hypointense signal intensity (also called flow-void sign) on the 3D-SPACE MR image indicates the absence of a complete stenosis. C, Coronal oblique curved reconstructed 3D-SPACE image demonstrates a narrow but open aqueduct (arrow). D and E, Axial (D) and sagittal (E) PC-MRI indicate a narrowed but open aqueduct, consistent with partial aqueductal stenosis (arrows).