 BRAIN: The cerebellar tonsils have a pointed configuration and lie 20 mm below the craniocervical junction, terminating at the C1-C2 level. The posterior fossa is mildly small. There is diminished CSF flow dorsally and mildly diminished as well as simultaneous bi-directional CSF flow ventrally at the craniocervical junction. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There are no areas of abnormal parenchymal signal. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The skull, paranasal sinuses, and scalp soft tissues are unremarkable. SPINE: 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 spinal cord displays normal signal and morphology with the conus terminating at L1. The paravertebral soft tissues are unremarkable.
Chiari I malformation without syringohydromyelia. 