title: Accessory lateral rectus muscle in a patient with congenital third-nerve palsy.
abstract: OBJECTIVE
  To report a case of accessory lateral rectus muscle in a patient with congenital third-nerve palsy.
  
  
  METHODS
  Observational case report.
  
  
  METHODS
  An 18-year-old boy with left exodeviation, ptosis, pupil dilation, and limited adduction, supraduction, and infraduction of his left eye. Left lateral rectus muscle recession and medial rectus muscle resection were done. An orbital computed tomographic (CT) scan was obtained.
  
  
  RESULTS
  Intraoperatively, an accessory muscle was found under the lateral rectus muscle. Postoperatively, the orbital CT scan showed accessory lateral rectus muscle located in the medial side of the lateral rectus muscle.
  
  
  CONCLUSIONS
  Accessory lateral rectus muscle was demonstrated in a patient with congenital third-nerve palsy using lateral rectus muscle surgery and an orbital CT scan.
authors.affiliation: Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
authors.forename: Choul Yong
authors.initials: CY
authors.lastname: Park
authors.forename: Sei Yeul
authors.initials: SY
authors.lastname: Oh
mesh_terms: D000293:Adolescent; D001763:Blepharoptosis / Q000151:congenital / Q000175:diagnosis; D005099:Exotropia / Q000151:congenital / Q000175:diagnosis; D005124:Eye Abnormalities / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D008297:Male; D009801:Oculomotor Muscles / Q000002:abnormalities* / Q000601:surgery; D015840:Oculomotor Nerve Diseases / Q000151:congenital*; D009915:Orbit / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed