title: Postoperative lumbar MR imaging with contrast enhancement. Comparison between symptomatic and asymptomatic patients.
abstract: PURPOSE AND MATERIAL: Contrast-enhanced MR imaging of the spine after surgery for lumbar disk herniation almost always shows pathologic changes. To investigate to what extent these changes are correlated to patients' actual clinical symptoms, we compared the postoperative MR findings in 19 asymptomatic patients with 42 symptomatic patients (43 levels).
  
  
  METHODS
  The asymptomatic patients underwent MR examination one year after surgery. Twenty-six of the symptomatic patients underwent MR one year or less after surgery, and in 16 patients (17 levels) MR was performed more than one year after surgery.
  
  
  RESULTS
  Sixteen percent of the asymptomatic and 42% of the symptomatic patients had disk herniation at the level of previous surgery. Most of the herniated disks were found in the symptomatic patients less than one year after surgery. The amount of epidural scar tissue, displacement and thickening of nerve roots, and compression of the dural sac were also studied. Disk herniation as a probable cause of recurrent sciatica was a common finding among symptomatic patients examined one year or less after surgery. In comparing asymptomatic patients and symptomatic patients with more than one year between surgery and MR examination, no significant radiologic differences, including disk herniation, were found.
authors.affiliation: Department of Neuroradiology, Karolinska Hospital, Stockholm, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Grane
authors.forename: T
authors.initials: T
authors.lastname: Tullberg
authors.forename: J
authors.initials: J
authors.lastname: Rydberg
authors.forename: L
authors.initials: L
authors.lastname: Lindgren
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D002921:Cicatrix / Q000473:pathology; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007403:Intervertebral Disc / Q000473:pathology* / Q000601:surgery; D007405:Intervertebral Disc Displacement / Q000150:complications / Q000473:pathology* / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D009942:Organometallic Compounds; D004369:Pentetic Acid / Q000031:analogs & derivatives; D011184:Postoperative Period; D012008:Recurrence; D012585:Sciatica / Q000453:epidemiology / Q000209:etiology; D013126:Spinal Nerve Roots / Q000473:pathology; D013997:Time Factors; D017211:Treatment Failure
chemical_list: D003287:Contrast Media; D009942:Organometallic Compounds; D004369:Pentetic Acid; D019786:Gadolinium DTPA