Syrinx, 6 month follow-up status post Chiari decompression. Cervical: Again seen are postsurgical changes of Chiari 1 decompression including suboccipital craniectomy and C1 laminectomy without significant change since 7/10/2014. There is good CSF space ventrally and dorsally at the C1 level which is improved compared to preoperative MRI. There is mildly diminished CSF space and biphasic flow ventral to the medulla and diminished to a relatively greater degree dorsal to the cerebellum, similar to 7/10/2014. Mild retroflexion of the dens is again seen which contributes to the effacement of the premedullary cistern.There is no cervical cord signal abnormality including no residual syrinx in the cervical cord. Minimal degenerative changes are seen including mild disc bulges at the C4-C5, C5-C6, and C6-C7 levels without significant spinal canal or neural foraminal stenosis at any level in the cervical spine. Vertebral body heights and alignment are maintained. Bone marrow signal is benign.Thoracic: At the mid T3 level there is a tiny residual syrinx which measures 1 to 2 mm and extends to the T7 level similar to prior MRI from 12/18/2014, but markedly improved from prior study from 2/3/2014.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 or neural foraminal stenosis. The paravertebral soft tissues are unremarkable. Again partially visualized is a T2 hyperintense lesion in the posterior right hepatic lobe which is not well evaluated and can be assessed with ultrasound as clinically warranted.
Postoperative changes of Chiari decompression again seen. No residual cervical syrinx. Minimal residual thoracic syrinx measuring 1 to 2 mm is not significantly changed since 12/18/2014 but markedly improved since study from 2/3/2014.