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Spinal cord injury (SCI) results in profound functional and sensory deficits, which negatively affect patient quality of life and increase the burden on the health care system. Unexpected patient deterioration associated with the development of a fluid-filled syrinx (or multiple separate syrinx cavities) can occur in up to 30% of cases from weeks to years after injury. 2, 12, 21 This condition is known as posttraumatic syringomyelia (PTS) and is characterized by the gradual onset of neuropathic pain, weakness, sensory loss, autonomic dysfunction, and spasticity in cases otherwise thought to be stable. Although PTS will develop in a large population of patients with SCI (up to 30%), not all cases are immediately symptomatic, most likely as a result of smaller syringes. 8, 12, 13, 17, 20 However, syrinx enlargement over time is common. 4, 16 Evidence suggests that PTS is increasingly recognized with the greater use of MR …