Syringomyelia

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Syringomyelia is a chronic and progressive condition caused by a longitudinal fluid-filled cavity within the spinal cord. The term includes hydromyelia, which is referred to a dilatation of the central canal by cerebro-spinal fluid usually in communication with the fourth ventricle [1]. This condition is the consequence of an impaired cerebrospinal fluid dynamics due to an obstruction of the spinal subarachnoid space. Different are the causes: acquired as trauma, infections, inflammations that cause arachnoid scars obstructing the spinal suba-rachnoid space below the foramen magnum (primary syringomyelia), or congenital anomalies, as the Chiari I malformations and other conditions associated with a small posterior fossa, that obstruct the subarachnoid space at the level of the foramen magnum (secondary syringomyelya) [2].