title: Enhanced depth imaging optical coherence tomography of congenital cavitary optic disc anomaly (CODA).
abstract: OBJECTIVE
  To report the finding of extension of the 4th hyper-reflective band and retinal tissue into the optic disc in patients with cavitary optic disc anomalies (CODAs).
  
  
  METHODS
  In this observational study, 10 patients (18 eyes) with sporadic or autosomal dominant CODA were evaluated with enhanced depth imaging optical coherence tomography (EDI-OCT) and colour fundus images for the presence of 4th hyper-reflective band extension into the optic disc.
  
  
  RESULTS
  Of 10 CODA patients (18 eyes), five patients (8 eyes) showed a definite 4th hyper-reflective band (presumed retinal pigment epithelium (RPE)) extension into the optic disc. In these five patients (seven eyes), the inner retinal layers also extended with the 4th hyper-reflective band into the optic disc. Best corrected visual acuity ranged from 20/20 to 20/200. In three patients (four eyes), retinal splitting/schisis was present and in two patients (two eyes), the macula was involved. In all cases, the 4th hyper-reflective band extended far beyond the termination of the choroid into the optic disc. The RPE extension was found either temporally or nasally in areas of optic nerve head excavation, most often adjacent to peripapillary pigment. Compared with eyes without RPE extension, eyes with RPE extension were more myopic (mean dioptres -0.9±2.6 vs -8.8±5, p=0.043).
  
  
  CONCLUSIONS
  The RPE usually stops near the optic nerve border separated by a border tissue. With CODA, extension of this hyper-reflective band and retinal tissue into the disc is possible and best evaluable using EDI-OCT or analogous image modalities. Whether this is a finding specific for CODA, linked to specific gene loci or is also seen in patients with other optic disc abnormalities needs further evaluation.
authors.affiliation: Department of Ophthalmology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA Department of Ophthalmology, Medical University of Vienna, Vienna, Austria.
authors.forename: Marion R
authors.initials: MR
authors.lastname: Munk
authors.affiliation: Department of Ophthalmology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: Evica
authors.initials: E
authors.lastname: Simjanoski
authors.affiliation: University of Iowa, Iowa City, Iowa, USA.
authors.forename: John H
authors.initials: JH
authors.lastname: Fingert
authors.affiliation: Department of Ophthalmology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: Lee M
authors.initials: LM
authors.lastname: Jampol
mesh_terms: D000328:Adult; D000368:Aged; D015785:Eye Diseases, Hereditary / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009412:Nerve Fibers / Q000473:pathology; D009898:Optic Disk / Q000002:abnormalities* / Q000473:pathology*; D012165:Retinal Ganglion Cells / Q000473:pathology; D055213:Retinal Pigment Epithelium / Q000473:pathology; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult
keywords: Imaging; Optic Nerve