title: [Diagnostic value of frozen section biopsy during surgery for breast lesions or neoplasms].
abstract: BACKGROUND
  During the surgical treatment of breast neoplasms (benign or malignant), frozen section biopsy is frequently requested to assess the kind of lesion and determine the surgical margins.
  
  
  OBJECTIVE
  To assess the diagnostic yield of frozen section breast biopsy.
  
  
  METHODS
  AH the pathological reports of frozen section biopsies and definitive biopsies of 337 women aged 26 to 88 years, operated for suspected breast neoplasms between 2002 and 2006, were reviewed. The sensitivity, specificity and predictive value of frozen section biopsy, were calculated using the definitive biopsy as the gold standard.
  
  
  RESULTS
  The definitive biopsy confirmed the presence of cancer in 290 women (86%). There were two false negative (0.59%) and no false positive frozen section biopsies for cancer detection. The sensibility for cancer detection was 99.3% and the specificity 100%. The positive predictive value was 100% and the negative predictive value 96.1%. The diagnosis of phyllodes tumor was missed by frozen section biopsy in three cases. The margins were informed in the 258 frozen section biopsies (79%) and in 59 cases (18%), these were positive for cancer.
  
  
  CONCLUSIONS
  Frozen section biopsy is useful and reliable for cancer detection and margin status assessment in breast cancer surgery.
authors.affiliation: Departamento de Anatomía Patológica, Universidad de La Frontera, Chile. ebellolio@gmail.com
authors.forename: Enrique
authors.initials: E
authors.lastname: Bellolio J
authors.forename: Pablo
authors.initials: P
authors.lastname: Guzmán G
authors.forename: Juan
authors.initials: J
authors.lastname: Orellana C
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Roa S
authors.forename: Miguel
authors.initials: M
authors.lastname: Villaseca H
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Araya O
authors.forename: Oscar
authors.initials: O
authors.lastname: Tapia E
authors.forename: Viviana
authors.initials: V
authors.lastname: Ineda N
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy / Q000379:methods*; D001943:Breast Neoplasms / Q000473:pathology*; D003951:Diagnostic Errors / Q000706:statistics & numerical data; D004812:Epidemiologic Methods; D005260:Female; D005629:Frozen Sections / Q000592:standards*; D006801:Humans; D007430:Intraoperative Care / Q000379:methods*; D008875:Middle Aged; D010173:Palpation