 The cerebellar tonsils are rounded in configuration and extend approximately 5 mm below the level of the foramen magnum. There is mild reversal of the normal cervical lordosis. There is anomalous morphology with butterfly configuration of the C3 vertebral body, and likely also involving C4 and C5 vertebral bodies. There is a rudimentary disc at the C6-C7 level with diminished anterior-posterior dimension of the C6 and C7 vertebrae as well as partial fusion of the right C6-C7 facet. No worrisome focal marrow signal abnormality is appreciated. The spinal cord is of normal caliber and signal. There is no pathological enhancement. There is no significant disk bulge, spinal canal or foraminal stenosis within the cervical spine. THORACIC SPINE
1. Prone sequences are degraded by motion artifact. However, there is a fibrofatty filum terminale from L4 to L5/S1 with probable tethered cord. Please correlate clinically.2. Multiple segmentation anomalies and butterfly vertebrae within the cervical, thoracic and lumbar spine as described above. Partial fusion of the L1-L2 vertebral bodies with posterior angulation, contributing to effacement of the ventral thecal sac at this level.3. Low-lying cerebellar tonsils with rounded configuration, not meeting strict criteria for Chiari 1 malformation.