title: Pseudoduplication of the optic nerve head.
abstract: BACKGROUND
  Pseudo-doubling of the optic nerve head is a spectacular clinical entity, in which a lesion resembling an optic disk appears adjacent to the true optic disk.
  
  
  METHODS
  A case of unilateral pseudo-doubling of the optic disk with bilateral optic nerve pits is presented.
  
  
  CONCLUSIONS
  The lesion is congenital, and represents a chorioretinal coloboma with optic disk involvement. Pseudo-doubling can be differentiated from true doubling of the optic nerve by the imaging techniques of ultrasonography, computerized tomography, and magnetic resonance imaging.
authors.affiliation: Department of Ophthalmology, Flinders Medical Centre, Bedford Park, Australia.
authors.forename: K
authors.initials: K
authors.lastname: Pesudovs
authors.forename: H S
authors.initials: HS
authors.lastname: Weisinger
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003103:Coloboma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009898:Optic Disk / Q000002:abnormalities* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography; D014792:Visual Acuity