Chiari I malformation: headache, presyncope, and blurred vision. Brain: The cerebellar tonsils extend up to approximately 6 mm inferior to the foramen magnum and display slightly pointed morphologies, which is similar to 2006. However, there appears to be grossly intact cerebrospinal fluid flow across the foramen magnum. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. The ventricles and basal cisterns are normal 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. There is paucity of the usual lordosis of the cervical vertebral column, but no spondylolisthesis. The cervical 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. The cerebellar tonsils extend up to approximately 6 mm inferior to the foramen magnum, which is similar to 2006. However, cerebrospinal fluid flow across the foramen magnum appears to be grossly intact.2. No evidence of syringohydromyelia.