 The cerebellar tonsils extend 5 mm below the level of the foramen magnum, similar to the prior study, again with moderate crowding at this level. The brainstem is again displaced ventrally at the foramen magnum.Previously noted central T2 hyperintensity within the cord, compatible with a syrinx, is again noted beginning at the level of mid C4 extending to at least T2. The inferior extent of the syrinx is not imaged. The maximal transverse dimensions are unchanged, again measuring 3 x 2 mm (image 25, series 601) at approximately the lower C6 level. Overall, the syrinx is unchanged in size and configuration.Straightening of the cervical spine is likely positional. The vertebral column alignment is otherwise within normal limits. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The paravertebral soft tissues are unremarkable.
1.Findings again compatible with Chiari I malformation. The cerebellar tonsils extend 5 mm below the level of the foramen magnum.2.No significant change in the imaged portion of the cervical syrinx, however the inferior extent is not imaged.