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Cerebellar tonsillar descent is noted with the tonsils extending to at least 10 mm below the level of the foramen magnum.
At the level of C2, there is a discrete syrinx. A second syrinx is identified extending from C6 to the midpoint of T3. The remaining spinal cord is normal and the conus ends at L1. No fatty filum identified. Right sided posterolateral disk herniation at C5/6 causes flattening of the
cord but without focal oedema, just above the more inferior syrinx.
Vertebral height, disc height, bone marrow signal and prevertebral soft tissues are normal. Loss of the normal cervical lordosis.
Conclusion: A type 1 Chiari malformation is identified with secondary syrinx formation in the cervical and upper thoracic spinal cord. Mild prominence of temporal horns. C5/6 disc as described, would not be related to provided clinical details. No supratentorial abnormality is identified.