Chiari malformation, concern for syrinx. The cerebellar tonsils have a pointed morphology and extend up to 20 mm inferior to the foramen magnum. There is interruption of cerebrospinal fluid flow across the foramen magnum. However, the spinal cord displays normal signal and morphology. 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. The paravertebral soft tissues are unremarkable.
Low-lying cerebellar tonsils compatible with Chiari I malformation, but no evidence of cervical syrinx.