title: [Spinal extradural arachnoid cyst: A case report and review of literature].
abstract: BACKGROUND
  Arachnoid cysts of spine are a very rare occurrence. The aetiology still remains unclear, but the most accepted explanation is the existence of areas of weakness in the spinal dura. Symptoms depend on the location in the spine. Magnetic resonance imaging is used for its diagnosis. Management depends of clinical presentation, and the surgery is reserved for patients with neurological impairment.
  
  
  METHODS
  A case is described of 67 year-old male with myelopathy and radiculopathy symptoms, both diagnosed simultaneously. The magnetic resonance imaging was used to diagnose a thoracolumbar extradural arachnoid cyst from T12-L2 and lumbar spinal canal stenosis. The patient was treated with a puncture procedure to empty the cyst and decompress the neural elements. There was a clinical improvement of myelopathy syndrome after puncture procedure. One month later, the patient underwent a minimally invasive surgical approach to decompress the neural elements in lumbar spine, achieving improvement of the radiculopathy syndrome and neurogenic claudication in both legs.
  
  
  CONCLUSIONS
  There is currently no standard minimally invasive approach to surgically treat these cysts, but if the patient has mild symptoms, clinical observation is recommended.
authors.affiliation: Centro Médico ABC, Campus Santa Fe, Centro Neurológico, Neurocirugía y Cirugía de Columna, Ciudad de México, México. Electronic address: a_i_o_n@hotmail.com.
authors.forename: Javier
authors.initials: J
authors.lastname: Quillo-Olvera
authors.affiliation: Hospital Médica Ebor, The Brain and Spine Care Center, Querétaro, México.
authors.forename: Javier
authors.initials: J
authors.lastname: Quillo-Reséndiz
authors.affiliation: Centro Médico ABC, Campus Santa Fe, Centro Neurológico, Neurocirugía y Cirugía de Columna, Ciudad de México, México.
authors.forename: Carlos-Francisco
authors.initials: CF
authors.lastname: Gutiérrez-Partida
authors.affiliation: Centro Médico ABC, Campus Santa Fe, Centro Neurológico, Neurocirugía y Cirugía de Columna, Ciudad de México, México.
authors.forename: Manuel
authors.initials: M
authors.lastname: Rodríguez-García
mesh_terms: D000368:Aged; D016080:Arachnoid Cysts / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D019299:Decompression, Surgical; D005471:Fluoroscopy; D006801:Humans; D007383:Intermittent Claudication / Q000209:etiology; D008159:Lumbar Vertebrae; D008279:Magnetic Resonance Imaging; D008297:Male; D019060:Minimally Invasive Surgical Procedures; D011128:Polyradiculopathy / Q000209:etiology; D015641:Radiography, Interventional; D013117:Spinal Cord Compression / Q000209:etiology; D013122:Spinal Diseases / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D013129:Spinal Puncture; D013130:Spinal Stenosis / Q000209:etiology; D013904:Thoracic Vertebrae
keywords: Cerebrospinal fluid; Columna toracolumbar; Líquido cefalorraquídeo; Quiste aracnoideo extradural espinal; Spinal extradural arachnoid cyst; Thoracolumbar spine