The exact cause is often unknown, but may be linked to a widening of the central canal of the spinal cord.
This may affect one or more cranial nerves, resulting in various kinds of facial palsies.
[2] Syringobulbia may be caused by a birth defect, trauma or tumor growth.
[citation needed] The exact trigger is unknown, but may be linked to a widening of the central canal of the spinal cord.
[1] Nerve fibres may be compressed where they cross the midline, or in other parts of the spinal cord.