Male, 6 years old, with history of Chiari malformation, pseudomeningocele, low-lying conus, evaluate for tethered cord. Evidence of suboccipital craniectomy is seen with expansion of the CSF space at the level of the foramen magnum and no crowding of the brainstem or cerebellar tonsils. Robust biphasic CSF flow is seen both anteriorly and posteriorly through the foramen magnum.The visualized spinal cord is within normal limits. No evidence of syrinx formation is seen. The conus tip terminates at the L1-2 level which is within normal limits. No evidence of fatty filum terminale is noted. On prone imaging, there is clear anterior shifting of the conus and cauda equina.A full complement of normally formed vertebral bodies is seen. Spinal alignment is anatomic. Marrow signal characteristics are within normal limits. The intervertebral discs are preserved. No compromise of the spinal canal or neural foramina is detected.
1.Evidence of suboccipital craniectomy for Chiari decompression is seen. The CSF space at the foramen magnum is well decompressed with no evidence of crowding and with adequate CSF flow both anteriorly and posteriorly.2.The remainder of the examination of the spine is within normal limits. No imaging evidence to suggest tethered cord is seen.