 Brain: There are postoperative findings related to suboccipital craniotomy for Chiari decompression. There is expected biphasic cerebrospinal fluid flow anteriorly and posteriorly across the neo-foramen magnum. The ventricles are unchanged in size and configuration. There is no evidence of acute infarction or hemorrhage. There is no evidence of pseudomeningocele.Cervical Spine: The cerebellar tonsils extend to the level of C1. At the C1-C2 level, there is unchanged focal syringohydromyelia, which measures up to 6 in width and 12 mm in length. There is minimal retroflexion of the dens and loss of the usual cervical lordosis. There is no evidence of vertebral subluxation. The vertebral body heights are preserved. There is no significant spinal canal or neural foraminal stenosis.
1.Postoperative findings related to Chiari decompression surgery with a patent neo-foramen magnum. 2.Persistent focal syringohydromyelia at the C1-C2 level.  