Chiari malformation and syrinx: worsening symptoms. Brain: There are postoperative findings related to Chiari decompression surgery. There appears to be intact cerebrospinal fluid flow across the posterior neo-foramen magnum, but it is reduced anteriorly in association with a small pannus posterior to the dens. The supratentorial brain is unremarkable. The ventricles are not enlarged. There is no evidence of acute infarct or intracranial mass. The orbits and paranasal sinuses are unremarkable.Spine: The discontinuous syrinx that extends from C4-C5 through L1-L2 is unchanged in caliber, measuring up to 6 mm at the midthoracic level. The vertebral column alignment is unchanged. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The paravertebral soft tissues are unchanged.
1. Persistent diffuse syringohydromyelia.2. Findings related to Chiari decompression surgery with reduced cerebrospinal fluid flow across the anterior neo-foramen magnum in association with a small pannus.