title: Appearance and vanishing of a spinal intradural arachnoid cyst after multiple epidural corticosteroid injections. A spontaneously resolving cause of symptomatic lumbar stenosis.
abstract: BACKGROUND
  Spinal intradural arachnoid cyst is a rare lesion, sometimes acquired.
  
  
  OBJECTIVE
  To describe the appearance and later spontaneous disappearence of a lumbar intradural arachnoid cyst, following perineural corticoid injections.
  
  
  METHODS
  Review of the clinical data and imaging, with final spontaneous return to initial state.
  
  
  CONCLUSIONS
  Atypical intradural arachnoid cysts can be related to perineural injections and can cause symptoms of spinal stenosis. Its spontaneous vanishing is a very rare event, up to now unreported.
authors.affiliation: Department of Medical Imaging, Clinique St Luc, Bouge, Belgium. p.mailleux@skynet.be
authors.forename: P
authors.initials: P
authors.lastname: Mailleux
authors.forename: G
authors.initials: G
authors.lastname: Milbouw
authors.forename: G
authors.initials: G
authors.lastname: Koerts
authors.forename: P
authors.initials: P
authors.lastname: Verbeek
authors.forename: X
authors.initials: X
authors.lastname: Willems
mesh_terms: D000305:Adrenal Cortex Hormones / Q000008:administration & dosage*; D000369:Aged, 80 and over; D016080:Arachnoid Cysts / Q000175:diagnosis* / Q000209:etiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007278:Injections, Spinal / Q000009:adverse effects*; D008161:Lumbosacral Region / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D012075:Remission, Spontaneous; D013118:Spinal Cord Diseases / Q000175:diagnosis* / Q000209:etiology*; D013130:Spinal Stenosis / Q000150:complications / Q000175:diagnosis* / Q000188:drug therapy*
chemical_list: D000305:Adrenal Cortex Hormones