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In page Syrinx (medicine):

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Syringomyelia is a paramedian, usually irregular, longitudinal cavity.[citation needed] It most often affects the cervical and thoracic regions but may extend further down or up into the brainstem (syringobulbia).[2] Syringobulbia, which is rare, usually occurs as a slitlike gap within the lower brain stem and may disrupt or compress the lower cranial nerves or ascending sensory or descending motor pathways.[citation needed]