Status post Chiari decompression, follow-up study There are postsurgical changes of Chiari decompression including suboccipital craniectomy and C1 laminectomy. Compared to preoperative study from 8/5/2015, there is improvement in the previously seen crowding of the foramen magnum, with increase in CSF spaces ventrally and dorsally on current study. CSF flow sequence demonstrates preserved biphasic flow both ventrally and dorsally at the foramen magnum; prior CSF flow imaging demonstrated severely diminished flow posteriorly.Again seen at the C2 level in the cord is tiny focus of T2 hyperintensity measuring less than 2 mm in the axial plane and 4 to 5 mm in the craniocaudal dimension, which is not significantly changed allowing for differences in measurement technique and compatible with tiny syrinx. In comparison of the high-resolution 3-D T2 sequences on the current and prior study, there is suggestion of slight decrease in size of the syrinx in the AP dimension. No new cord signal abnormality. Syrinx is relatively more convincingly smaller when compared to 8/20/2013.Vertebral body heights and alignment the cervical spine are normal. Bone marrow signal is benign. There is no significant disc disease at any level. There is no spinal canal or neural foraminal stenosis at any level. Partially empty sella is again noted.
1. Expected postsurgical changes of Chiari decompression. There is improvement in the CSF spaces and biphasic flow at the foramen magnum.2. Tiny syrinx at the C2 level is stable to slightly decreased in size since preoperative study dated 8/5/2015.