title: MRI of marked dural sac compression by surgicel in the immediately postoperative period after uncomplicated lumbar laminectomy.
abstract: OBJECTIVE
  Our purpose was to determine what represents normal findings on MR examinations of the lumbar spine in the immediately postoperative period following lumbar laminectomy with retained Surgicel.
  
  
  METHODS
  MR examinations were performed immediately following lumbar laminectomy in 10 patients referred for symptoms of spinal stenosis. All had Surgicel retained against the dura and were doing well postoperatively without suggestion of adverse symptoms. Images were obtained within 4 days of surgery, most within 24 h.
  
  
  RESULTS
  In 9 of 10 patients, severe dural tube compression was present, greater than that evident on preoperative studies.
  
  
  CONCLUSIONS
  Marked spinal canal compression can be a normal finding in the immediately postlaminectomy period in patients with retained Surgicel. There is a lack of correlation between apparent mass effect on the thecal sac and adverse effect. The MR appearance in such instances is not significant in the absence of compressive clinical symptomatology.
authors.affiliation: Department of Radiology, St. Louis University Medical Center, MO 63110-0250, USA.
authors.forename: E E
authors.initials: EE
authors.lastname: Awwad
authors.forename: K R
authors.initials: KR
authors.lastname: Smith
mesh_terms: D000273:Adipose Tissue / Q000637:transplantation; D002483:Cellulose, Oxidized / Q000009:adverse effects*; D017586:Diskectomy; D004388:Dura Mater / Q000473:pathology*; D005500:Follow-Up Studies; D006490:Hemostatics / Q000009:adverse effects*; D006801:Humans; D007796:Laminectomy / Q000009:adverse effects*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D009192:Myelography; D011184:Postoperative Period; D011312:Pressure; D013130:Spinal Stenosis / Q000601:surgery; D014057:Tomography, X-Ray Computed
chemical_list: D002483:Cellulose, Oxidized; D006490:Hemostatics; C013695:Surgicel