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CSF pulsation artifact. (a) Axial T2-weighted FSE MRI image (slice thickness, 3 mm) of the upper cervical spine demonstrates CSF pulsation artifact within the thecal sac, more prominent at the dorsal aspect (arrow). (b) Axial FIESTA-C MRI image (slice thickness, 1.2 mm) through the same level demonstrates homogeneous high signal of CSF and elimination of the pulsation artifact.
