title: Primary orbital melanoma masquerading as vascular anomalies.
abstract: OBJECTIVE
  To review two cases of primary orbital melanoma presenting like orbital vascular anomalies.
  
  
  METHODS
  Retrospective review of clinical presentation, treatment, radiology and pathology for two patients under the care of the Orbital Clinic at Moorfields Eye Hospital.
  
  
  RESULTS
  Both lesions presented with the appearance and behaviour of vascular anomalies. In one case, a spindle cell melanoma appeared to be a low flow vascular anomaly with a loculated secondary haemorrhage and, in the other case, a melanoma of soft parts was considered to be an arteriovenous malformation and responded partially to embolisation.
  
  
  CONCLUSIONS
  Primary malignant melanoma may present as a secondary vascular lesion of the orbit and this very rare tumour should be considered in the differential diagnosis of any vascular anomaly.
authors.affiliation: Moorfields Eye Hospital, London, UK.
authors.forename: V
authors.initials: V
authors.lastname: Lee
authors.forename: C
authors.initials: C
authors.lastname: Sandy
authors.forename: G E
authors.initials: GE
authors.lastname: Rose
authors.forename: I M
authors.initials: IM
authors.lastname: Moseley
authors.forename: I
authors.initials: I
authors.lastname: Cree
authors.forename: J L
authors.initials: JL
authors.lastname: Hungerford
mesh_terms: D000328:Adult; D001165:Arteriovenous Malformations / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis*; D008875:Middle Aged; D009915:Orbit / Q000098:blood supply*; D009918:Orbital Neoplasms / Q000175:diagnosis*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed