title: Post-traumatic syringomyelia.
abstract: METHODS
  This study retrospectively analyzed patients who developed post-traumatic syringomyelia secondary to spinal cord injury.
  
  
  OBJECTIVE
  To identify an indicator that would predict the outcome of surgical treatment for post-traumatic syringomyelia.
  
  
  BACKGROUND
  Syrinx-subarachnoid shunting was chosen as a surgical treatment for post-traumatic syringomyelia. No previous study has been published concerning magnetic resonance imaging findings' ability to predict surgical results before surgery.
  
  
  METHODS
  Nine patients diagnosed by magnetic resonance imaging with post-traumatic syringomyelia were the subjects of this study. The magnetic resonance imaging findings and surgical results were analyzed.
  
  
  RESULTS
  Neurologic deterioration was found in five patients. Ascending dissociated sensory disturbances and motor weakness were noticed to occur characteristically above the level of the spinal cord injury. The other four patients complained of a slight worsening of numbness without displaying neurologic deterioration. The five patients with neurologic deterioration were treated with a syrinx-subarachnoid shunting. Two of the five patients experienced sustained neurologic improvement after a midline myelotomy, which allowed the fluid within the syrinx to spout out and cause the expanded spinal cord to collapse. This was called a "high-pressure syrinx." In these two patients, the preoperative magnetic resonance imaging demonstrated a positive flow-void sign. On the other hand, drainage of the syrinx in the three patients with a negative flow-void sign did not collapse the expanded spinal cord, and the surgical results were considered fair. This was called a "low-pressure syrinx."
  
  
  CONCLUSIONS
  Post-traumatic syringomyelia was classified into two types. A preoperative distinction could be made based on the presence or absence of the flow-void sign on a T2-weighted magnetic resonance image.
authors.affiliation: Department of Orthopaedic Surgery, Hoshigaoka Koseinenkin Hospital, Osaka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Asano
authors.forename: K
authors.initials: K
authors.lastname: Fujiwara
authors.forename: K
authors.initials: K
authors.lastname: Yonenobu
authors.forename: K
authors.initials: K
authors.lastname: Hiroshima
mesh_terms: D000293:Adolescent; D000328:Adult; D002574:Cervical Vertebrae / Q000293:injuries; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011859:Radiography; D012189:Retrospective Studies; D013119:Spinal Cord Injuries / Q000150:complications* / Q000000981:diagnostic imaging; D016103:Spinal Fractures / Q000150:complications; D013595:Syringomyelia / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D013904:Thoracic Vertebrae / Q000293:injuries; D016896:Treatment Outcome