title: Intraoperative high-field magnetic resonance imaging combined with fiber tract neuronavigation-guided resection of cerebral lesions involving optic radiation.
abstract: BACKGROUND
  Intraoperative magnetic resonance imaging (iMRI) combined with optic radiation neuronavigation may be safer for resection of cerebral lesions involving the optic radiation.
  
  
  OBJECTIVE
  To investigate whether iMRI combined with optic radiation neuronavigation can help maximize tumor resection while protecting the patient's visual field.
  
  
  METHODS
  Forty-four patients with cerebral tumors adjacent to the optic radiation were enrolled in the study. The reconstructed optic radiations were observed so that a reasonable surgical plan could be developed. During the surgery, microscope-based fiber tract neuronavigation was routinely implemented. The lesion location (lateral or not to the optic radiation) and course of the optic radiation (stretched or not) were categorized, and their relationships to the visual field defect were determined.
  
  
  RESULTS
  Analysis of the visible relationship between the optic radiation and the lesion led to a change in surgical approach in 6 patients (14%). The mean tumor residual rate for glioma patients was 5.3% (n = 36) and 0% for patients with nonglioma lesions (n = 8). Intraoperative MRI and fiber tract neuronavigation increased the average size of resection (first and last iMRI scanning, 88.3% vs 95.7%; P < .01). Visual fields after surgery improved in 5 cases (11.4%), exhibited no change in 36 cases (81.8%), and were aggravated in 3 cases (6.8%).
  
  
  CONCLUSIONS
  Diffusion tensor imaging information was helpful in surgical planning. When iMRI was combined with fiber tract neuronavigation, the resection rate of brain lesions involving the optic radiation was increased in most patients without harming the patients' visual fields.
authors.affiliation: Department of Neurosurgery, PLA General Hospital, Beijing, China.
authors.forename: Guo-chen
authors.initials: GC
authors.lastname: Sun
authors.forename: Xiao-lei
authors.initials: XL
authors.lastname: Chen
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Bao-ke
authors.initials: BK
authors.lastname: Hou
authors.forename: Yu-bo
authors.initials: YB
authors.lastname: Wang
authors.forename: Zhi-jun
authors.initials: ZJ
authors.lastname: Song
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Bai-nan
authors.initials: BN
authors.lastname: Xu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D054022:Cerebrum / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D005910:Glioma / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods; D038361:Neuronavigation / Q000379:methods*; D011446:Prospective Studies; D011859:Radiography; D011879:Radiotherapy Dosage; D014795:Visual Pathways / Q000000981:diagnostic imaging / Q000601:surgery*; D055815:Young Adult