12-year-old with history of Chiari malformation and syrinx. Interval follow-up exam. Cervical spine: Redemonstrated findings of a partially visualized Chiari 1 malformation with extension of the cerebellar tonsils 10 mm below the foramen magnum. There is crowding of the foramen magnum with partially diminished CSF spaces foramen magnum. CSF flow imaging shows diminished but present biphasic flow both anteriorly and posteriorly. Stable syringomyelia of the low cervical spine cord at the C6 and C7 levels which measures 16 mm in the craniocaudal dimension and 2 x 3 mm and axial dimension. There is also trace prominence of the central canal in the mid lower thoracic cord without frank syrinx formation, similar to prior. Redemonstration of decreased signal in the vertebral discs at C2-3 and C3-4 indicating desiccation which is associated with slight reversal of the cervical lordosis. Alignment is otherwise maintained. The vertebral body and intervertebral disc heights are preserved. Bone marrow signal is within normal limits. No significant spinal canal or neural foraminal stenosis.Thoracic spine:Alignment is within normal limits. The vertebral body and intervertebral disc heights are preserved. Bone marrow signal is within normal limits. No significant spinal canal or neural foraminal stenosis. Slight prominence of the central spinal canal as described above, otherwise the cord has normal signal and morphology.Lumbar spine:Alignment is within normal limits. The vertebral body and intervertebral disc heights are preserved. Bone marrow signal is within normal limits. No significant spinal canal or neural foraminal stenosis. The spinal cord has normal signal and morphology throughout. The conus medullaris terminates at the L1-2 level. The filum terminale is normal in appearance.
1. Stable findings of Chiari 1 malformation with the cerebellar tonsils extending 10 mm below the foramen magnum. There are diminished CSF spaces at the foramen magnum with preserved biphasic flow ventrally and dorsally. 2. Stable mild syringomyelia of the cervical spinal cord and trace prominence of the central canal in the thoracic cord.3. No findings to suggest tethered cord.