title: [Low field intra-operative magnetic resonance imaging for brain tumour surgery: preliminary experience].
abstract: OBJECTIVE
  Intra-operative magnetic resonance imaging (iMRI) is a recently introduced tool in the most advanced neurosurgical operating rooms worldwide. We present our preliminary experience in brain tumour surgery with low field PoleStar N30® intraoperative MRI since its introduction in 2013 in the Barcelona Clinic Hospital.
  
  
  METHODS
  A prospective non-randomised study was conducted on cases operated on using iMRI and intention of complete removal up to October 2015. A record was made of the data as regards surgical times, resection rates, histological diagnosis, hospital stay, and survival rates during follow-up.
  
  
  RESULTS
  The study included 50 patients, with a mean age of 55 years (±13.7), a preoperative mean Karnofsky of 92 (being 81 post-operatively), and a mean follow-up of 10.5 months (±6.5). There were 26% re-operations due to recurrence. High-grade gliomas were reported in 56%, low-grade gliomas in 24%, and 20% "Other" tumours. Overall hospital stay was 10 days (±4.5). Depending on the histologiacl diagnosis, the "Others" group had a longer hospital stay. Overall, there were 52% complete removal, 18% of maximum removals, and 30% of partial removals. The overall survival rates during follow-up was 84%.
  
  
  CONCLUSIONS
  iMRI is a safe and effective tool for brain tumour surgery. Its use allows an increase in resection rates, and minimises post-operative complications. Its implementation involves an increase in surgical time, which improves with the characteristic learning curve. More studies are needed to establish its role in the long-term survival of patients.
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España. Electronic address: pedro.roldanramos@gmail.com.
authors.forename: Pedro
authors.initials: P
authors.lastname: Roldán
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Sergio
authors.initials: S
authors.lastname: García
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Josep
authors.initials: J
authors.lastname: González
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Luis Alberto
authors.initials: LA
authors.lastname: Reyes
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Jorge
authors.initials: J
authors.lastname: Torales
authors.affiliation: Servicio de Anestesiología y Reanimación, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Ricard
authors.initials: R
authors.lastname: Valero
authors.affiliation: Servicio de Radiodiagnóstico, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Laura
authors.initials: L
authors.lastname: Oleaga
authors.affiliation: Servicio de Neurocirugía, Hospital Clínic de Barcelona, Barcelona, España.
authors.forename: Joaquim
authors.initials: J
authors.lastname: Enseñat
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D003399:Craniotomy / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D005910:Glioma / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D006801:Humans; D007432:Intraoperative Period; D053208:Kaplan-Meier Estimate; D007902:Length of Stay / Q000706:statistics & numerical data; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging / Q000601:surgery; D038361:Neuronavigation / Q000379:methods*; D061646:Operative Time; D011183:Postoperative Complications / Q000517:prevention & control; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D016896:Treatment Outcome
keywords: Craneotomía; Craniotomy; Glioma; Intra-operative magnetic resonance imaging; Intra-operative neuroimaging; Neurocirugía; Neuroimágen intraoperatoria; Neuronavegación; Neuronavigation; Neurosurgery; Resonancia magnética intraoperatoria