Chiari malformation with syrinx in thoracic spine: yearly follow up. There are postoperative findings related to Chiari decompression with a patent neo-foramen magnum and biphasic cerebrospinal fluid flow anteriorly. The long-segment syrinx appears to have a slightly larger caliber, measuring up to 3 mm, previously 2 mm. The vertebral column alignment is unchanged, with diffuse straightening in the sagittal plane. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The paravertebral soft tissues are unremarkable. However, there is a horseshoe kidney with persistently prominent renal collecting systems and a distended bladder.
1. Postoperative findings related to Chiari decompression with a grossly patent neo-foramen magnum.2. The long-segment syrinx appears to have a slightly larger caliber, measuring up to 3 mm, previously 2 mm. 3. Horseshoe kidney with persistently prominent renal collecting systems and a distended bladder.