title: Mammographic halo sign revisited.
abstract: OBJECTIVE
  To determine whether increased silver halide deposition accounts for some curvilinear areas of hyperlucency (halo signs) that surround breast masses on screen-film mammograms.
  
  
  METHODS
  Breast images obtained in 43 women (aged 30-67 years; mean, 48.6 years) that showed a halo sign were selected from the authors' teaching files. Optical magnification (x8.0-12.5) of the masses with halos was used to establish the pattern of silver halide deposition in the film emulsion.
  
  
  RESULTS
  True radiolucent halos, differentiated from Mach bands by means of the increased silver halide deposition in the film emulsion, were identified in 44 masses in 36 women. Partial true radiolucent halos were identified in 32 (73%) of 44 masses. Thirty-eight (86%) of the 44 masses were cysts; three (7%), fibroadenomas; two (4%), infiltrating ductal carcinomas; and one (2%), axillary lymph node metastasis. True radiolucent halos were more common in growing benign and malignant lesions.
  
  
  CONCLUSIONS
  A halo is not always a perceptual illusion.
authors.affiliation: Susan G. Komen Breast Center, Saint Francis Medical Center, Peoria, IL 61614, USA.
authors.forename: T E
authors.initials: TE
authors.lastname: Cupples
authors.forename: G W
authors.initials: GW
authors.lastname: Eklund
authors.forename: G
authors.initials: G
authors.lastname: Cardenosa
mesh_terms: D001941:Breast Diseases / Q000000981:diagnostic imaging; D001943:Breast Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008327:Mammography / Q000592:standards; D008875:Middle Aged; D009903:Optical Illusions; D019047:Phantoms, Imaging; D018030:Silver Compounds; D014963:X-Ray Intensifying Screens
chemical_list: D018030:Silver Compounds