title: Orbital color Doppler imaging of optic nerve tumors.
abstract: OBJECTIVE
  To report changes in retinal arterial and venous blood flow pattern in two patients with tumors involving the entire optic nerve.
  
  
  METHODS
  Retrospective review of one patient with clinical and neuroimaging characteristics typical of bilateral optic nerve gliomas and one patient with a probable meningioma of the left optic nerve sheath.
  
  
  RESULTS
  The optic nerve glioma patient had reduced peak systolic velocity of central retinal arteries bilaterally, while the patient with an optic nerve sheath meningioma had relatively low central retinal artery flow velocity and intermittent blood flow in the central retinal vein on the affected side.
  
  
  CONCLUSIONS
  Reduced retinal arterial flow velocities in the setting of optic nerve gliomas may correlate with the presence of optic nerve disease. Phasic blood flow in the central retinal vein with optic nerve sheath meningioma may be the reason that some patients with this tumor develop retinal choroidal venous anastomoses.
authors.affiliation: Radiology Department, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.
authors.forename: C
authors.initials: C
authors.lastname: Jacquemin
authors.forename: T
authors.initials: T
authors.lastname: Bosley
authors.forename: P
authors.initials: P
authors.lastname: Mullaney
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008579:Meningioma / Q000098:blood supply / Q000000981:diagnostic imaging*; D020339:Optic Nerve Glioma / Q000098:blood supply / Q000000981:diagnostic imaging*; D019574:Optic Nerve Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging*; D009915:Orbit / Q000000981:diagnostic imaging*; D011379:Prognosis; D012161:Retinal Artery / Q000000981:diagnostic imaging*; D012169:Retinal Vein / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D018615:Ultrasonography, Doppler, Color