title: Ultrasonographic evidence of a mushroom-shaped choroidal metastasis.
abstract: OBJECTIVE
  To describe the evolution of a "collar-button" or mushroom-shaped choroidal metastasis.
  
  
  METHODS
  Case report.
  
  
  RESULTS
  A 52-year-old woman with known primary colon cancer and widespread extraocular metastases developed bilateral choroidal masses with neurosensory retinal detachments. Clinical and ultrasound evaluation demonstrated evolution of a choroidal metastasis with a "collar-button" configuration in the right eye.
  
  
  CONCLUSIONS
  A choroidal metastasis may develop a mushroom-shaped configuration. This "collar-button" configuration is not pathognomonic for choroidal melanoma.
authors.affiliation: Department of Ophthalmology, Saint Louis University Health Sciences Center, St. Louis, Missouri, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Ward
authors.forename: B J
authors.initials: BJ
authors.lastname: Byrne
authors.forename: M C
authors.initials: MC
authors.lastname: Kincaid
authors.forename: E S
authors.initials: ES
authors.lastname: Mann
mesh_terms: D002830:Choroid Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D003110:Colonic Neoplasms / Q000473:pathology*; D005260:Female; D005654:Fundus Oculi; D006801:Humans; D008545:Melanoma / Q000000981:diagnostic imaging* / Q000556:secondary*; D008875:Middle Aged; D012163:Retinal Detachment / Q000000981:diagnostic imaging; D014463:Ultrasonography