Chiari decompression, evaluate decompression and syrinx change. Patient had difficulty tolerating the study, and examination is technically degraded. There are interval postsurgical changes of Chiari decompression including suboccipital craniectomy, resection of posterior arch of C1, and reduction in cerebellar tonsillar tissue. There is interval increase in CSF spaces ventrally and dorsally at the foramen magnum as well as at the C1-C2 level. Cervical syrinx which extends throughout the cervical cord and into the partially imaged thoracic cord is again seen with interval decrease in size. For example at the C6-C7 level syrinx measures 5 x 8 mm in the AP and transverse dimensions, previously 7 x 12 mm, measured similarly. Residual syrinx in the cervical cord more superiorly is noted to predominantly occupy the right aspect of the cord.Vertebral body heights and alignment are maintained. There is no significant spinal canal stenosis or neural foraminal stenosis.The vertebral artery flow voids appear to be intact. Paraspinous soft tissue structures are grossly unremarkable.
Interval postsurgical changes of Chiari decompression with increase in CSF spaces at the foramen magnum and C1-C2 level. There is also interval decrease in size of the visualized portion of the syrinx.Please note patient could not tolerate the study. Cervical spine study is technically degraded, and thoracic spine MRI has been rescheduled.