Chiari malformation with syrinx: 1 year follow up. Brain: There are postoperative findings related to foramen magnum decompression with an unchanged configuration of the cerebellar tonsils. There is biphasic CSF flow across the foramen magnum, although the flow stream anteriorly remains mildly constricted due to retroclination of the dens. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. The ventricles and basal cisterns are normal in size and configuration.Spine: There has been slight interval decrease in size of the syringohydromyelia at C6-7, which measures 2 x 3 mm in axial cross section, previously also 2 x 3 mm. Likewise, the trace syringohydromyelia in the thoracic spine is unchanged. The vertebral column alignment is unchanged, with reversal of the usual lordosis. The vertebral body heights are preserved. There is no significant spinal canal stenosis. The paraspinal soft tissues are unchanged.
1. Postoperative findings related to foramen magnum decompression with biphasic CSF flow across the foramen magnum, although the flow stream anteriorly is mildly constricted due to retroclination of the dens2. No significant change in size of the syringohydromyelia within the cervical and thoracic spinal cord. 