title: Primary intraosseous hemangioma of the orbit: an unusual presentation of an uncommon tumor.
abstract: METHODS
  An asymptomatic patient was referred for assessment of an intraocular amelanotic mass in her left eye. Examination showed a mass effect in the inferior location at the 5 o'clock position. This abnormality was defined with ultrasound biomicroscopy and standard ultrasound, but because the appearance was not typical of a melanoma or other choroidal infiltrate, magnetic resonance images and computed tomograms of the orbits were obtained, identifying an extraocular mass arising from the zygomatic rim. Results of a biopsy reported an intraosseous hemangioma.
  
  
  CONCLUSIONS
  The diagnosis of intraosseous hemangioma, because of its low incidence and unusual manner of presentation, can be challenging. Computed tomography and biopsy are helpful in making a definitive diagnosis.
authors.affiliation: Ocular Oncology Clinic, Department of Ophthalmology, Princess Margaret Hospital, UHN, Toronto, Ontario, Canada. Luis.Riveros@uhn.on.ca
authors.forename: Luis G
authors.initials: LG
authors.lastname: Riveros
authors.forename: E Rand
authors.initials: ER
authors.lastname: Simpson
authors.forename: Dan D
authors.initials: DD
authors.lastname: DeAngelis
authors.forename: David
authors.initials: D
authors.lastname: Howarth
authors.forename: Hugh
authors.initials: H
authors.lastname: McGowan
authors.forename: Edward
authors.initials: E
authors.lastname: Kassel
mesh_terms: D000368:Aged; D001706:Biopsy; D005260:Female; D006391:Hemangioma / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography; D015050:Zygoma / Q000000981:diagnostic imaging / Q000473:pathology*