Left arm weakness, chronic basilar invagination with dens extending through the foramen magnum seen on CT head Redemonstration of minimal dens protrusion into the foramen magnum without adjacent cervicomedullary junction signal abnormality. There is developmental narrowing of the cervical spinal canal. Diffuse T1 and T2 hyperintensity of the clivus and vertebrae, compatible with radiation changes.Spinal cord is without evidence of cord signal abnormality. No intraspinal hematoma. Alignment is anatomic. Preservation of cervical lordosis. Multilevel diffuse moderate disc height loss. Vertebral body heights are preserved.C1/2: No significant spinal canal stenosis or foraminal narrowing.C2/3: Ligamentum flavum thickening without significant spinal canal stenosis or foraminal narrowing.C3/4: Small posterior disc osteophyte complex. Uncovertebral hypertrophy, right greater than left. Endplate degenerative changes. Mild spinal canal stenosis. Moderate right and mild left foraminal narrowing. C4/5: Trace diffuse disc bulge. Ligamentum flavum thickening with right greater than uncovertebral arthropathy. Mild to moderate stenosis of the spinal canal. Moderate right foraminal narrowing. Mild left foraminal narrowing.C5/6: Trace disc bulge. Ligamentum flavum thickening with right uncovertebral arthropathy. Moderate stenosis of the spinal canal. Moderate to severe right foraminal narrowing.C6/7: Trace disc bulge with superimposed right paracentral shallow disc protrusion. Ligamentum flavum thickening with right uncovertebral arthropathy. Moderate stenosis of the spinal canal.C7/T1: Mild ligamentum flavum thickening with mild disc bulge. Mild stenosis of the spinal canal. Mild left foraminal narrowing.
1.Redemonstration of minimal dens protrusion into the foramen magnum without adjacent cervicomedullary junction signal abnormality. 2.Developmental narrowing of the spinal canal. Degenerative joint disease of the cervical spine most the thickened at C5/6 level, with moderate central spinal canal stenosis and moderate-severe right foraminal narrowing. Additional moderate central spinal canal stenosis at C4-C5 and C6-C7.