title: Atypical chorioretinal coloboma in a Golden Retriever: a retinographic, fluoroangiographic, and optical coherence tomography study.
abstract: OBJECTIVE
  To report a case of canine atypical chorioretinal coloboma where ophthalmoscopic, fluoroangiographic and optical coherence tomography characteristics are described.
  
  
  METHODS
  A 2-year-old Golden Retriever dog in which routine ophthalmoscopic examination allowed diagnosis of a posterior coloboma on the left eye.
  
  
  METHODS
  Retinography, fluorescein angiography, and optical coherence tomography were performed to characterize the lesion of the left fundus.
  
  
  RESULTS
  Ophthalmoscopy revealed a pigmented circumscribed lesion dorsal to the optic nerve of the left fundus, surrounded by small areas of hyper-reflectivity and retinal vessels with an abnormal pattern. Fluoroangiography revealed a constant hypofluorescence of the defect and a complete altered vascular pattern associated with the coloboma. Optical coherence study demonstrated an important craterlike depression showing an atrophic neurosensory retina, and a lack of retinal pigment epithelium and choroidal tissue.
  
  
  CONCLUSIONS
  Fluoroangiographic and optical coherence tomographic studies of an atypical chorioretinal coloboma in a dog are reported for the first time. Both imaging techniques are of great importance to characterize this type of congenital defects.
authors.affiliation: Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria de la Universidad Complutense de Madrid, Hospital Clínico Veterinario Complutense, Avda. Puerta de Hierro s/n, 28040, Madrid, Spain. elisag@ucm.es.
authors.forename: Elisa M
authors.initials: EM
authors.lastname: Gonzalez-Alonso-Alegre
authors.affiliation: Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria de la Universidad Complutense de Madrid, Hospital Clínico Veterinario Complutense, Avda. Puerta de Hierro s/n, 28040, Madrid, Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Rodriguez-Alvaro
authors.affiliation: Clinica Veterinaria Oftalmológica Ocaña, C/de Ocaña n° 201, 28047, Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Esteban-Martín
mesh_terms: D000818:Animals; D002829:Choroid; D003103:Coloboma / Q000000981:diagnostic imaging / Q000662:veterinary*; D004283:Dog Diseases / Q000000981:diagnostic imaging*; D004285:Dogs; D005451:Fluorescein Angiography / Q000662:veterinary; D005654:Fundus Oculi; D041623:Tomography, Optical Coherence / Q000662:veterinary
keywords: atypical coloboma; choroid; dog; fluorescein angiography; optical coherence tomography; retina