Chiari decompression. Brain: There is artifact related to dental braces, which obscures portion of the anterior head on some sequences. There are postoperative findings related to Chiari decompression surgery with extradural fluid that measures up to 8 mm in thickness in the surgical bed. The cerebellar tonsils have a rounded morphology and extend inferiorly to the level of the tip of the dens. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.Cervical Spine: The spinal cord displays normal signal and morphology. There is a narrow column of cerebrospinal fluid flow across the anterior neo-foramen magnum and no discernible flow posteriorly. The vertebral column alignment is within normal limits. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis.
1. Interval Chiari decompression surgery with a narrow column of cerebrospinal fluid flow across the anterior neo-foramen magnum and no discernible flow posteriorly. 2. No evidence of syringohydromyelia.