Progressive visual loss and severe retinal degeneration in a captive Kodiak bear ( Ursus arctos mittendorfi)
SUMMARY A 27‐year‐old female Kodiak bear displayed signs of progressive visual loss over an 18‐year period. The bear was examined under general anaesthesia, where fixed mydriatic pupils, a diffusely hyper‐reflective retina with vascular attenuation was observed. An electroretinogram was performed bi...
Published in: | Veterinary Record Case Reports |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2020
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Subjects: | |
Online Access: | http://dx.doi.org/10.1136/vetreccr-2020-001115 https://onlinelibrary.wiley.com/doi/pdf/10.1136/vetreccr-2020-001115 https://onlinelibrary.wiley.com/doi/full-xml/10.1136/vetreccr-2020-001115 |
Summary: | SUMMARY A 27‐year‐old female Kodiak bear displayed signs of progressive visual loss over an 18‐year period. The bear was examined under general anaesthesia, where fixed mydriatic pupils, a diffusely hyper‐reflective retina with vascular attenuation was observed. An electroretinogram was performed bilaterally, revealing no electrical activity associated with either retina and confirming a diagnosis of severe bilateral retinal degeneration. The bear was euthanased eight months later due to a diagnosis of a metastasised hepatic neoplasm. Histopathology of the bear's eyes revealed marked outer layer retinal degeneration. The aetiology of this retinal degeneration could not be confirmed. |
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