Syringomyelia, is a rare neurological disorder in which a Cerebrospinal-filled cyst, or syrinx, forms within the spinal cord central canal. The growing syrinx can damage the centre of the spinal cord, resulting in pain, weakness, and stiffness in the back, shoulders, arms or legs. Other symptoms may include headaches and a loss of the ability to feel extremes of hot or cold, especially in the hands. Some individuals also have severe arm and neck pain. A syrinx may be caused after spinal injury or CSF disruption due to a Chiari Malformation and in some cases it's idiopathic.