Reason: CT head from outside facility showing crowding of cerebellar tonsils at framen magnum, r/ochiari type malformation History: headaches, dizziness,lightheadness The cervical vertebral bodies are appropriate in overall alignment and height. The cervical spinal cord has normal signal characteristics and overall morphology. There is multilevel disk desiccation present.The cerebellar tonsils extend through the foramen magnum and lie approximately 9 mm below the level of the foramen magnum.CSF flow study demonstrates normal biphasic flow.At C2-3 there is no significant compromise to the spinal canal or neural foramina.At C3-4 there is no significant compromise to the spinal canal or neural foramina.At C4-5 there is no significant compromise to the spinal canal or neural foramina.At C5-6 there is no significant compromise to the spinal canal or neural foramina. There is a minor disk bulge present at this level.At C6-7 there is no significant compromise to the spinal canal or neural foramina. There is a minor disk bulge present at this level.At C7-T1 there is no significant compromise to the spinal canal or neural foramina.The vertebral artery flow voids appear to be intact. The right vertebral artery is larger than the left vertebral artery.
1. Chiari I malformation . There is no significant CSF obstruction at the level of the foramen magnum appreciated based on the CSF flow study.2.There is no significant compromise of cervical spinal canal or exiting nerve roots.