Status post Chiari decompression 7/9/2015, follow-up examination There are postsurgical changes of suboccipital craniectomy and posterior C1 arch resection for Chiari decompression with interval improvement in subarachnoid spaces at the level of the foramen magnum. There is good CSF present ventrally and dorsally at the level of the foramen magnum. CSF flow sequence demonstrates preserved biphasic flow at the craniocervical junction with heterogeneous flow dorsal to the inferior cerebellum most likely artifactual. Limited visualization of the brain is unremarkable without evidence of hydrocephalus or intracranial mass effect. The cervical spinal cord has normal signal characteristics and overall morphology.Minimal changes are seen in the cervical spine as described below:C2-3: No significant compromise to the spinal canal or neural foramina.C3-4: No significant compromise to the spinal canal or neural foramina.C4-5: No significant compromise to the spinal canal or neural foramina.C5-6: Minimal disc bulge. No significant compromise to the spinal canal or neural foramina.C6-7: No significant compromise to the spinal canal or neural foramina.C7-T1: No significant compromise to the spinal canal or neural foramina.The vertebral artery flow voids appear to be intact. Paraspinous soft tissue structures appear within normal limits. Small suboccipital fluid collection measuring 9 mm in thickness and 2 cm in the craniocaudal dimension is noted at the level of the suboccipital craniectomy which may represent a tiny pseudomeningocele.
Postsurgical changes of Chiari decompression with preserved CSF spaces and biphasic flow at the foramen magnum.