Chiari and shunt: surveillance. Brain: There is unchanged extension of the cerebellar tonsils inferior to the foramen magnum up to 5 mm. Nevertheless, the cerebellar tonsils display rounded morphologies. The cerebrospinal fluid flow across the anterior aspect of the foramen magnum is intact, but appears to be blunted posteriorly. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. The ventricles are unchanged in size and configuration. There is no midline shift. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.Cervical Spine: 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.
1. Unchanged mildly low lying cerebellar tonsils.2. No evidence of syringohydromyelia.