Female, 30 years old, with Chiari malformation. The right cerebellar tonsil descends approximately 8 to 9 mm below the level of the foramen magnum. The left cerebellar tonsil descends approximately 6 mm below the level of the foramen magnum. Both tonsils demonstrate a peglike morphology. Findings have not significantly changed from prior. The CSF space at the foramen magnum is partially effaced but some CSF signal does remain along the brainstem and tonsils. Robust biphasic CSF flow is seen through the anterior foramen magnum. Mild but detectable CSF flow is seen through the posterior foramen magnum including around the cerebellar tonsils. Findings have not significantly changed.The visualized spinal cord is morphologically normal. No evidence of syrinx formation is seen. The conus terminates at the T12 level. The nerve roots of the cauda equina are evenly distributed through the thecal sac. No intraspinal masses are seen.Spinal alignment is anatomic. There is a transitional morphology of the L5 vertebral body. No pathologic marrow replacement or marrow edema is suspected.A small central disk protrusion at C5-6 is unchanged. No significant degenerative disk disease is seen elsewhere in the spine. No spinal canal or neuroforaminal stenosis is detected.
Redemonstration of Chiari I malformation without significant change from the prior exam. The CSF space at the foramen magnum is partially effaced. CSF flow is robust along the anterior foramen magnum, but a mild degree of flow is also seen posteriorly and around the cerebellar tonsils, similar to prior.No evidence of syrinx or any other significant abnormality is seen in the spinal cord. A small central disk protrusion at C5-6 is unchanged. Evaluation of the spine is otherwise unremarkable.