title: Topless optic disk syndrome without maternal diabetes mellitus.
abstract: OBJECTIVE
  To describe four cases of topless optic disk syndrome without maternal diabetes mellitus.
  
  
  METHODS
  Four patients had incidentally discovered inferior visual field defects.
  
  
  RESULTS
  Ophthalmoscopic examinations in all four patients disclosed superiorly displaced entrances of the central retinal artery and thinning of the superior peripapillary nerve fiber layers. One patient had a superior peripapillary crescent with pallor of the superior disk. These clinical findings were consistent with a diagnosis of superior segmental optic hypoplasia, the topless disk. None of the patients had mothers who had diabetes.
  
  
  CONCLUSIONS
  The topless optic disk syndrome can occur in the absence of maternal diabetes mellitus.
authors.affiliation: Department of Ophthalmology, Sapporo Medical University, School of Medicine, Hokkaido, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hashimoto
authors.forename: K
authors.initials: K
authors.lastname: Ohtsuka
authors.forename: T
authors.initials: T
authors.lastname: Nakagawa
authors.forename: W F
authors.initials: WF
authors.lastname: Hoyt
mesh_terms: D000328:Adult; D002648:Child; D048909:Diabetes Complications; D005124:Eye Abnormalities / Q000175:diagnosis / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000002:abnormalities* / Q000473:pathology; D009900:Optic Nerve / Q000002:abnormalities* / Q000473:pathology; D009901:Optic Nerve Diseases / Q000175:diagnosis / Q000209:etiology*; D013577:Syndrome; D014786:Vision Disorders / Q000175:diagnosis / Q000209:etiology*; D014794:Visual Fields