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Basilar invagination is invagination (infolding) of the base of the skull that occurs when the top of the C2 vertebra migrates upward. It can cause narrowing of the foramen magnum (the opening in the skull where the spinal cord passes through to the brain). It also may press on the lower brainstem.〔 () 〕 This is similar to Chiari malformation. That, however, is usually present at birth. ==Symptoms== Symptoms vary depending on whether the spinal cord, brain stem, nerves or their blood supply is affected by the pressure. Symptoms become apparent when the neck is bent. They include: *Posterior head pain *Neck weakness *Periods of confusion *Dysarthria (difficulty swallowing or talking due to loss of muscle control) *Dizziness *Loss of sensation *Cranial nerve disturbance *Loss of the ability to know how joints are positioned *Lhermitte's sign ('electric shock sensation' down spine and/or to the extremities when the neck is flexed forward) *Weakness of the arms and legs *Orthostatic hypotension *Patients will go into a pool and notice that below their belly button the water is not as cold as it is above. Complications from this can include hydrocephalus, pseudotumor cerebri or syringomyelia because it blocks the flow of fluid around the brain and spinal cord. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Basilar invagination」の詳細全文を読む スポンサード リンク
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