Male, 15 years old, with Chiari malformation. Evaluate for syrinx and for tethered cord. The cerebellar tonsils are pointed and descend 7 mm below the level of the foramen magnum. There is crowding at the level of the posterior foramen magnum. Robust biphasic CSF flow is seen along the anterior brainstem through the foramen magnum. Minimal CSF flow is seen posteriorly and along the cervical tonsils.There is a normal complement of vertebral bodies. No evidence of any segmentation anomaly is seen. Spinal alignment is anatomic. Vertebral body morphology and signal characteristics are within normal limits. The intervertebral discs are normal. No significant compromise of the spinal canal or neural foramina is noted.The visualized spinal cord demonstrates normal signal intensity and morphology throughout. No evidence of syrinx formation is seen. The conus tip terminates at the L1 level which is normal. The nerve roots of the cauda equina disperse evenly through the thecal sac. No intraspinal mass lesion or fibrofatty infiltration of the filum terminale is seen. No epidural abnormalities are suspected. On prone imaging, a mild anterior displacement of the conus and cauda equina nerve roots is demonstrated.
1.Findings compatible with Chiari I malformation.2.No evidence of syrinx formation or any findings to suggest tethered cord.