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Atypical chorioretinal coloboma in a Golden Retriever: a retinographic, fluoroangiographic, and optical coherence tomography study

Gonzalez‐Alonso‐Alegre, Elisa M., Rodriguez‐Alvaro, Alfonso, Esteban‐Martín, Javier
Veterinary ophthalmology 2016 v.19 no.6 pp. 525-530
Golden Retriever, angiography, congenital abnormalities, dogs, epithelium, image analysis, nerve tissue, ophthalmology, retina, tomography
PURPOSE: To report a case of canine atypical chorioretinal coloboma where ophthalmoscopic, fluoroangiographic and optical coherence tomography characteristics are described. ANIMAL STUDIED: A 2‐year‐old Golden Retriever dog in which routine ophthalmoscopic examination allowed diagnosis of a posterior coloboma on the left eye. PROCEDURES: 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.