Re-do Chiari decompression. Brain: There are postoperative findings related to revision Chiari decompression with a small amount of fluid in the extradural surgical bed. There appears to be flow of cerebrospinal fluid into the fourth ventricle, which has decreased in size, although it remains dilated. The third and lateral ventricles are also less dilated. There is a small amount of pneumocephalus and trace blood products layering within the occipital horns of the lateral ventricles. There is edema and restricted diffusion along the margins of the cerebellar tonsillectomy sites. There is no evidence of acute infarct. There is no midline shift. The major cerebral flow voids are intact. The orbits are grossly unremarkable.Spine: There is interval decrease in caliber of the long-segment, partially-septated, cervicothoracic syringohydromyelia, now measuring up to 10 mm in width, previously 16 mm, and extending from C2 to T8. There is unchanged mild thoracic scoliosis. 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 revision Chiari decompression with decreased dilatation of the ventricular system.2. Interval decrease in caliber of the cervicothoracic syringohydromyelia.