title: Computer-aided detection in diagnostic mammography: detection of clinically unsuspected cancers.
abstract: OBJECTIVE
  We had two objectives: to determine the percentage of women presenting with clinical findings whose diagnostic mammogram led to detection of a breast cancer at a site distant from the original clinical complaint and to assess the performance of computer-aided detection (CAD) on diagnostic mammography.
  
  
  METHODS
  Three institutions contributed consecutive cases in which a mammogram was obtained to evaluate a clinical finding, after which a histologic diagnosis of breast cancer was made. Clinical data and the mammograms were reviewed to determine the nature of the clinical findings and to document the location and characteristics of 212 biopsy-proven cancers in 197 patients who met the study criteria. Standard four-view breast mammograms were then analyzed by a CAD system.
  
  
  RESULTS
  The most common clinical finding was a palpable mass (90%, 177/197), with nipple discharge (5%, 9/197), focal tenderness or pain (2%, 5/197), and miscellaneous complaints (3%, 6/197) also noted. Two separate cancers were found in 7.6% (15/197) of the cases. In another 7.6% (15/197) of the cases, the single diagnosed cancer was not at the location of the specific clinical finding. The CAD system correctly marked 87% (26/30) of those cancers that were clinically unsuspected (i.e., not at the location of the clinical finding).
  
  
  CONCLUSIONS
  Breast cancers occurred at locations other than the site of the presenting clinical finding in 15% (30/197) of patients undergoing diagnostic mammography in whom a cancer was detected. CAD identified 87% of these incidentally detected cancers and may therefore be useful as a detection aid to the radiologist when interpreting diagnostic mammograms.
authors.affiliation: Department of Radiology, Kaiser Permanente, 2238 Geary Blvd., San Francisco, CA 94115, USA.
authors.forename: Sherry A
authors.initials: SA
authors.lastname: Butler
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Gabbay
authors.forename: Deborah A
authors.initials: DA
authors.lastname: Kass
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Siedler
authors.forename: Kathryn F
authors.initials: KF
authors.lastname: O'shaughnessy
authors.forename: Ronald A
authors.initials: RA
authors.lastname: Castellino
mesh_terms: D001943:Breast Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008327:Mammography; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging; D011857:Radiographic Image Interpretation, Computer-Assisted