Chiari, syrinx, follow-up evaluation. Cervical spine:Postoperative changes of Chiari decompression with tonsillar descent appears similar to the prior exam. A fourth ventricle stent appears grossly unchanged from the prior exam. Cervicomedullary kinking is unchanged. Vertebral body heights and disc spaces are maintained. Alignment is anatomic. Benign marrow signal. Syrinx extending from the foramen magnum into the thoracic spine similar in size and appearance to the prior exam measuring 2 x 1.5 mm at C4-C5, previously 2 x 1.5 mm, and 2 x 2 mm at C7-T1, previously 2 x 2 mm. No significant spinal or neural foraminal stenosis.Thoracic spine:There is levoscoliosis of the upper thoracic spine and dextroscoliosis of the lower thoracolumbar spine. Mild straightening of the thoracic spine. Vertebral body heights and disc spaces are intact. Benign marrow signal. Syrinx extends from the cervical spine to the T10-T11 level and is unchanged in distribution and size measuring up to 4.0 x 3.5 cm at the T3-T4 level. No significant spinal or neural foraminal stenosis.Paraspinous soft tissues are within normal limits.
Stable post Chiari decompression changes. No significant change in size and extent of cervicothoracic syringohydromyelia compared to 4/2015.