20 year-old female with a history of Chiari malformation without. MRI BRAIN:No restricted diffusion to suggest acute ischemia. No intracranial hemorrhage. No intracranial mass or mass-effect. The ventricles are within normal limits in size and configuration. There is pointed descent of the cerebellar of about 11 mm below the foramen magnum bilaterally. There is no associated platybasia. There is marked effacement of dorsal CSF space without any associated spinal cord signal changes. There is biphasic flow on phase contrast images across the foramen magnum though attenuated.Brain parenchyma is otherwise unremarkable for age.Major flow-voids are preserved.Sella and orbits are grossly within normal limits. Paranasal sinuses and mastoid cells are clear. Bone marrow signal and extracranial soft tissues are within normal limits. Cervical Spine:The cervical spine is in normal alignment, with a normal cervical lordosis. The vertebral body and disk heights are well-maintained. However, signal loss within the C2-C3 disc is indicative of desiccation. No worrisome focal marrow signal abnormality is appreciated. The spinal cord is of normal caliber and signal.There is no significant disk bulge, herniation, spinal canal or foraminal stenosis within the cervical spine.
1. Chiari I malformation with pointed cerebellar tonsillar descent of 11 mm into the foramen magnum and effacement of the dorsal CSF space. Biphasic flow remains across the foramen magnum and no concerning associated spinal cord or cerebellar signal changes.2. Loss of signal within the C2-C3 disc is indicative of desiccation. The cervical spine is otherwise unremarkable.