 There are postoperative findings related to suboccipital craniectomy for Chiari malformation. The cerebellar tonsils are unchanged in appearance. There is unchanged retroflexion of the dens resulting in diminished CSF anteriorly at the craniocervical junction and slightly turbulent simultaneous bidirectional flow just inferiorly at the level of the dens. The turbulence is decreased compared with the prior exam. There is adequate CSF space posteriorly at the craniocervical junction, with biphasic flow visualized. There is unchanged posterior tenting of the cervicomedullary junction compatible with adhesion.
Post-operative findings related to sub-occipital craniectomy with an unchanged possible adhesion at the cervicomedullary junction as well as unchanged dens retroflexion resulting in diminished and slightly turbulent CSF flow anteriorly. The CSF flow dynamics do appear slightly improved compared with the prior exam.