 Bilateral cerebellar tonsils extend below the level of the foramen magnum approximately 10-11 mm, demonstrating a peglike appearance, partially effacing the posterior CSF space. CSF flow analysis demonstrates a small amount of biphasic CSF flow at the level of the cerebellar tonsils.There are no fractures. The marrow signal is benign. The cervical and upper thoracic cord are normal in signal. The cervicomedullary junction is normal. The cerebellar tonsils are in normal position. The visualized paraspinal contents are unremarkable.C1/2: Ligament thickening posterior to the odontoid tip narrows the anterior CSF space without cervicomedullary abutment.C2/3: Trace anterolisthesis C2 on C3, osteophyte disc complex, bilateral uncinate hypertrophy, mild left facet hypertrophy, and moderate right facet hypertrophy. There is mild to moderate bilateral neural foraminal stenosis. Posterior to the hypertrophic right facet joint, there is a 2 cm transverse x 1.3 cm AP x 1.0 cm craniocaudal mass which abuts the adjacent osseous structures and follows fat intensity on all sequences including inversion technique.C3/4: Osteophyte disc complex, left uncinate hypertrophy, and moderate left facet hypertrophy with partial facet fusion. There is severe left neural foraminal stenosis.C4/5: Osteophyte disc complex, left uncinate hypertrophy, moderate left facet hypertrophy, and ligamentum flavum thickening. There is mild central and moderate to severe left neural foraminal stenosis.C5/6: Posterior osteophyte disc complex, bilateral uncinate hypertrophy, mild left facet appear to be, and ligament flavum thickening. There is mild central, moderate to severe left neural foraminal, and severe right neural foraminal stenosis.C6/7: Trace anterolisthesis C6 on C7, minimal disc bulge, and moderate right facet hypertrophy. There is mild right neural foraminal stenosis.C7/T1: Minimal disc bulge and mild bilateral facet hypertrophy. There is mild bilateral neural foraminal stenosis.
1.Bilateral cerebellar tonsils extend below the level of the foramen magnum approximately 10-11 mm, demonstrating a peglike appearance, partially effacing the posterior CSF space, consistent with Chiari I malformation. CSF flow analysis demonstrates a small amount of biphasic CSF flow at the level of the cerebellar tonsils.2.C2/3: There is mild to moderate bilateral neural foraminal stenosis. Posterior to the hypertrophic right facet joint, there is a 2 cm transverse x 1.3 cm AP x 1.0 cm craniocaudal mass which abuts the adjacent osseous structures and follows fat intensity on all sequences including inversion technique. This is of uncertain etiology or significance, and CT could better define the association with the adjacent facet if deemed clinically beneficial.3.C3/4: Severe left neural foraminal stenosis.4.C4/5: Mild central and moderate to severe left neural foraminal stenosis.5.C5/6: Mild central, moderate to severe left neural foraminal, and severe right neural foraminal stenosis.6.C6/7: Mild right neural foraminal stenosis.7.C7/T1: Mild bilateral neural foraminal stenosis.