title: Lumbosacral transitional vertebra and S1 radiculopathy: the value of coronal MR imaging.
abstract: BACKGROUND
  The association of a lumbosacral transitional vertebra with accelerated degeneration of the disc above has been described. Lumbosacral transitional vertebrae have also been reported as a cause of extraforaminal entrapment of the L5 nerve root between the transverse segment of the transitional vertebra and the sacral ala optimally demonstrated by coronal MRI. The association of the lumbosacral transitional vertebra pseudoarthroses and S1 nerve root entrapment due to degenerative stenosis of the nerve root canal has never been described.
  
  
  METHODS
  We present 12 patients with lumbosacral transitional vertebrae that were referred for symptoms and signs of S1 nerve root radiculopathy in which the sagittal and axial MRI sequences failed to identify a plausible cause for the patients' S1 nerve root symptoms. A coronal T1-weighted imaging (T1WI) MRI sequence was consequently added to the investigation.
  
  
  RESULTS
  The coronal T1WI MRI sequence demonstrated hypertrophic degenerative stenosis of the S1 nerve root canal at the level of the lumbosacral transitional vertebra pseudoarthrosis, with entrapment of the respective S1 nerve root in all patients.
  
  
  CONCLUSIONS
  We emphasize the value of coronal T1WI MRI of the lumbosacral junction and sacrum if the cause for S1 radicular symptoms was not identified on conventional sagittal and axial MRI sequences in patients with lumbosacral transitional vertebrae.
authors.affiliation: Division of Radiodiagnosis, Department of Medical Imaging and Clinical Oncology, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 19179, Tygerberg, 7505, South Africa, fouriebez@yahoo.com.
authors.forename: Abraham Fourie
authors.initials: AF
authors.lastname: Bezuidenhout
authors.forename: Jan Willem
authors.initials: JW
authors.lastname: Lotz
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D055959:Intervertebral Disc Degeneration / Q000175:diagnosis*; D008161:Lumbosacral Region / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011843:Radiculopathy / Q000175:diagnosis*; D013130:Spinal Stenosis / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed
references.citation: Korean J Radiol. 2012 Jul-Aug;13(4):403-11
references.pmid: 22778561
references.citation: Spine (Phila Pa 1976). 1997 Apr 1;22(7):823-6
references.pmid: 9106326
references.citation: Radiology. 2012 Nov;265(2):497-503
references.pmid: 22952380
references.citation: Spine (Phila Pa 1976). 1989 Dec;14(12):1373-7
references.pmid: 2533403
references.citation: Spine (Phila Pa 1976). 1984 Jul-Aug;9(5):493-5
references.pmid: 6495013
references.citation: Acta Radiol. 1996 Sep;37(5):610-3
references.pmid: 8915261
references.citation: AJNR Am J Neuroradiol. 2010 Nov;31(10):1778-86
references.pmid: 20203111