title: Lumbar nerve root compression caused by lumbar intraspinal gas. Report of three cases.
abstract: METHODS
  Three cases of lumbar nerve root compression associated with intradiscal gas formation and its migration are reported.
  
  
  OBJECTIVE
  To establish the pathogenic mechanism by which gas is formed in the spinal canal.
  
  
  BACKGROUND
  Few such cases have been reported of patients with clinical symptoms of lumbar radiculopathy resulting from gas in the spinal canal.
  
  
  METHODS
  Surgery with needle aspiration of the gas was performed in all cases.
  
  
  RESULTS
  The presence of the gas was detected in the extradural space in one patient and within the nerve sheath in two patients. After surgery, all patients recovered well, and there were no obvious remnant neurologic abnormalities. One year later, all patients were completely free of symptoms.
  
  
  CONCLUSIONS
  Surgery with needle aspiration of the gas resulted in clinical improvement in all cases, confirming that intraspinal gas is an important cause of lumbar radiculopathy. The composition of the gas in one patient was analyzed by gas chromatography, which revealed an overwhelming preponderance of nitrogen. A relationship between a gas-containing pseudocyst in the spinal canal and a degenerated intervertebral disc was identified, a key finding for understanding the precise nature of this disorder. Intradiscal gas formation and its outward migration as a sequel of intervertebral disc degeneration also has been addressed in this report.
authors.affiliation: Department of Orthopaedic Surgery, Suwa Central Hospital, Nagano, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Shinomiya
authors.forename: O
authors.initials: O
authors.lastname: Nakai
authors.forename: Y
authors.initials: Y
authors.lastname: Kurosa
authors.forename: I
authors.initials: I
authors.lastname: Yamaura
mesh_terms: D000368:Aged; D002849:Chromatography, Gas; D005260:Female; D005740:Gases; D006801:Humans; D007403:Intervertebral Disc / Q000473:pathology / Q000601:surgery; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D013115:Spinal Canal / Q000473:pathology* / Q000601:surgery; D013126:Spinal Nerve Roots / Q000000981:diagnostic imaging / Q000601:surgery*; D014057:Tomography, X-Ray Computed
chemical_list: D005740:Gases