 MRI brain: There is about 10 mm inferior descent of the right cerebellar tonsil below the foramen magnum consistent with a Chiari I malformation.The ventricles and sulci are within normal limits. The cisterns remain patent. There is no midline shift or mass effect. There are no areas of abnormal signal or pathological enhancement. There is no diffusion abnormality. No extra-axial fluid collection is identified. Normal flow-voids are demonstrated in the major intracranial vascular structures. MRI cervical spine:There is a cervical syrinx which begins at the level of the C1 vertebra extending down up to mid C3 level. The syrinx occupies nearly the entire diameter of the cervical cord, measuring about 10 x 8mm in maximum axial dimensions when measured at the lower C2 vertebral body level. In the CC dimension, the syrinx extends up to 13 mm. There is no abnormal enhancement in the cervical spinal cord. There is normal biphasic CSF flow through the anterior foramen magnum, and diminished flow posteriorly.The cervical spine is in normal alignment, with a normal cervical lordosis. The vertebral body and disk heights are well-maintained. No worrisome focal marrow signal abnormality is appreciated. The spinal cord is of normal caliber and signal. There is no pathological enhancement.The intervertebral discs are preserved. No significant spinal canal or foraminal stenosis is seen. The paraspinal soft tissue structures are unremarkable.
1. Findings compatible with Chiari I malformation. Otherwise, MRI of the brain is unremarkable.2. Syringohydromyelia involving the upper cervical cord extending from C1 to mid C3 vertebral body as described.