title: Intradural Spinal Arachnoid Cyst: A Long-Term Postlaminectomy Complication: A Case Report and Review of the Literature.
abstract: BACKGROUND
  Spinal arachnoid cysts are a rare cause of spinal cord compression. Intradural arachnoid cysts are rarer than extradural arachnoid cysts. Spinal arachnoid cysts are mostly congenital in origin. Arachnoid cysts due to trauma, lumbar puncture, or surgery are rarely reported. Most arachnoid cysts are located posterior to the spinal cord in the thoracic regions. The ideal treatment is laminectomy or laminoplasty with puncture, marsupialization, or excision. But the development of a cervico-thoracic spinal intradural extramedullary arachnoid cyst anteriorly located 28 years after laminectomy is a recognizable complication of laminectomy.
  
  
  METHODS
  We report here a case of a 45-year-old man who underwent C6-T1 laminectomy at the age of 17 years for cervical intervertebral disc prolapse (C6/7, C7/T1) and compressive myelopathy. Twenty-eight years after laminectomy, he developed spastic quadriparesis and was diagnosed with a spinal intradural extramedullary anterior arachnoid cyst at the laminectomy site with compressive myelopathy.
  
  
  CONCLUSIONS
  So, although laminectomy with excision is usually practiced to treat spinal arachnoid cysts, laminectomy itself is a cause of development of intradural arachnoid cysts.
authors.affiliation: Department of Neurosurgery, SCB Medical College, Cuttack, Odisha, India. Electronic address: drpratapnath@rediffmail.com.
authors.forename: Pratap Chandra
authors.initials: PC
authors.lastname: Nath
authors.affiliation: Department of Neurosurgery, SCB Medical College, Cuttack, Odisha, India.
authors.forename: Sudhansu Sekhar
authors.initials: SS
authors.lastname: Mishra
authors.affiliation: Department of Neurosurgery, SCB Medical College, Cuttack, Odisha, India.
authors.forename: Rama Chandra
authors.initials: RC
authors.lastname: Deo
authors.affiliation: Department of Neurosurgery, SCB Medical College, Cuttack, Odisha, India.
authors.forename: Mani Charan
authors.initials: MC
authors.lastname: Satapathy
mesh_terms: D000293:Adolescent; D016080:Arachnoid Cysts / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery*; D002574:Cervical Vertebrae; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D007796:Laminectomy / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D011782:Quadriplegia / Q000209:etiology / Q000601:surgery; D013117:Spinal Cord Compression / Q000601:surgery*; D013118:Spinal Cord Diseases / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery*; D013904:Thoracic Vertebrae; D013997:Time Factors; D014057:Tomography, X-Ray Computed
keywords: Arachnoid cyst; Extramedullary; Intradural; Postlaminectomy complication; Surgical treatment