 There are findings related to revision Chiari decompression with interval resolution of a fluid collection superificial to the reconstructed dura in the posterior neck. There is biphasic flow of cerebrospinal fluid flow across the anterior foramen magnum, but persistent paucity of flow posteriorly. There is also unchanged encephalomalacia and deformity of the posterior cerebellum. In addition, there is persistent indentation of the left posterolateral aspect of the medulla by the inferior left cerebral hemisphere. There is a punctate focus of susceptibility effect in the left cerebellar hemisphere as well, which is nonspecific. There is no evidence of hydrocephalus, acute infarct, acute hemorrhage, or mass lesion. There is unchanged encephalomalacia involving the right medial orbitofrontal and straight gyri and left straight gyrus. There are prominent perivascular spaces in the left basal ganglia. The major intracranial vascular flow voids appear intact. There is a small right maxillary sinus retention cyst.
1.Postoperative findings related to revision Chiari decompression with interval resolution of the pseudomeningocele. 2.Persistent paucity of cerebrospinal fluid flow across the foramen magnum posteriorly, which may be in part attributable to adhesion formation. 3.Unchanged encephalomalacia involving the right medial orbitofrontal and straight gyri and left straight gyrus, which is likely related to remote trauma.