Chiari malformation with cervical syrinx: new back/neck pain. There are postoperative findings related to Chiari decompression. The cerebellum is low-lying and appears adherent to the overlying dura posteriorly. There is increase in size of the cervical syrinx, with a cavity that measures up to 17 mm in width at the C2 and C3 levels. Inferior to the cavity, there is diffuse high T2 signal and swelling of the spinal cord from the C4 to C7 levels. The thoracic spinal cord is unremarkable. There is mild retroflexion of the dens. There is markedly impeded flow of cerebrospinal fluid across the neo-foramen magnum. 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. Postoperative findings related to Chiari decompression. The cerebellum is low-lying and appears adherent to the overlying dura posteriorly, which may be due to adhesions. 2. Increase in size of the cervical syrinx since 2013, with a cavity that measures up to 17 mm in width at the C2 and C3 levels with what likely represents pre-syrinx from C4 to C7.