Chiari malformation and low lying conus with new symptoms: headaches, frequent urination, leg pain, and back pain. Brain: There are postoperative findings related to Chiari decompression with cerebrospinal fluid flow present across the anterior and posterior neo-foramen magnum. There is nearly resolved diffuse posterior fossa subdural effusion. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is unchanged linear T2 hyperintensity in the left centrum semiovale that is likely related to a prior surgical tract. The brain parenchyma otherwise appears unremarkable. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits are grossly unremarkable. There is a right maxillary sinus retention cyst.Spine: There are postoperative findings in the lumbar spine. The spinal cord displays normal signal and morphology. The conus medullaris is positioned at the L2-3 level. 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. Expected findings related to related to Chiari decompression.2. No evidence of syringohydromyelia.3. The conus medullaris is positioned at the L2-3 level. 