Chiari malformation. There is artifact related to a left cochlear implant. The cerebellar tonsils extend below the foramen magnum by approximately 10 mm and have a pointed morphology, consistent with Chiari I malformation. There is narrowing of the column of cerebrospinal fluid flow anteriorly across the foramen magnum and obstruction of the column of cerebrospinal fluid flow posteriorly across the foramen magnum. There is no evidence of a syrinx. 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.
Findings consistent with Chiari I malformation without evidence of a syrinx. I personally reviewed the Images and/or procedure with the Resident/Fellow and agree with this report.