|
FIG 1. Fourth ventricular CSF pulsation artifact in four subjects.
A–C, FLAIR axial images of three patients show increasing severity of fourth ventricular CSF pulsation artifact with increasing age: grade 0 in a 32-year-old (A); grade 1 in a 43-year-old (B); and grade 2 in a 71-year-old (C). Subarachnoid CSF artifact is also present in the basal cisterns in B and C.
D, The fourth ventricular CSF pulsation artifact that was present on the axial FLAIR image (C) is not visible on this sagittal FLAIR image.
E, FLAIR axial image of a subject with fourth ventricular CSF pulsation artifact also shows ghost pulsation artifacts (arrows) in the phase-encoding axis (left to right), causing superimposition of hyperintensities on the bilateral cerebellar parenchyma.
|