title: Necessity of preoperative screening for brain metastasis in non-small cell lung cancer patients without lymph node metastasis.
abstract: BACKGROUND
  The exclusion of brain metastasis is important to determine the optimal treatment plan in patients with non-small cell lung cancer (NSCLC). However, a routine examination using magnetic resonance imaging (MRI) for the brain remains controversial in preoperative patients with resectable disease.
  
  
  METHODS
  To assess the necessity of routine brain MRI for preoperative patients, a retrospective analysis for a consecutive series of 338 patients with NSCLC was performed. Among the 338 patients, 141 patients who were considered to have potentially resectable diseases through an examination of the chest plus an upper abdominal computed tomography scan and bone radioisotope scan with no neurological symptoms received MRI for examination of brain metastasis.
  
  
  RESULTS
  The incidence of brain metastasis detected by MRI was 2.1% (three of 141) in all patients, 0% (zero of 80) in patients with N0 disease, 5.2% (one of 19) in N1, and 4.7% (two of 42) in N2 cases.
  
  
  CONCLUSIONS
  In patients with resectable NSCLC, a brain MRI is not considered to be useful due to the low incidence of asymptomatic brain metastasis.
authors.affiliation: Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka, Japan.
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Yohena
authors.forename: Ichiro
authors.initials: I
authors.lastname: Yoshino
authors.forename: Masachika
authors.initials: M
authors.lastname: Kitajima
authors.forename: Tadashi
authors.initials: T
authors.lastname: Uehara
authors.forename: Takanori
authors.initials: T
authors.lastname: Kanematsu
authors.forename: Takao
authors.initials: T
authors.lastname: Teruya
authors.forename: Jiro
authors.initials: J
authors.lastname: Ikeda
authors.forename: Yukito
authors.initials: Y
authors.lastname: Ichinose
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000556:secondary*; D002289:Carcinoma, Non-Small-Cell Lung / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008175:Lung Neoplasms / Q000473:pathology* / Q000601:surgery; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011300:Preoperative Care; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome