BILATERAL RETINOSCHISIS IN A LABRADOR RETRIEVER
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A 11âyearâold neutered male Labrador retrieverâcross dog was presented to the University of MissouriâColumbia Veterinary Ophthalmology Service for subtle visual deficits. Indirect ophthalmoscopy revealed a smooth, bullous elevation in the superiorâtemporal retina OU. Optical coherence tomography (OCT) performed OU showed inner retinal separation consistent with retinoschisis. History, clinical, and diagnostic findings, with the absence of disease progression over time, are analogous with cases of acquired senile retinoschisis in humans. A very interesting case report!
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Electroretinography (ERG) revealed markedly reduced bâwave amplitudes in the more severely affected eye (OD) compared with the less severely affected eye (OS).
The most notable reductions were in the rod response and 30âHz flicker bâwaves OD which were approximately 50% of the corresponding amplitudes OS. Implicit times, particularly the aâwave implicit times, were noticeably longer OD compared with OS.
Lesions remained unchanged over 4 months at which time the dog was humanely euthanized for reasons unrelated to the ocular disease.
Significant light microscopic ocular findings were bilateral superior temporal peripheral retinoschisis.
The separation of the retinal tissue was similar between eyes and effectively divided the outer plexiform layer.
In addition, thinning of the surrounding retinal layers was present.
To the authorsâ knowledge, this is the first case of canine retinoschisis diagnosed with OCT, evaluated with electroretinography, and confirmed with light microscopic examination.
Source: Elizabeth A. F. Schaefer Rebecca E. H. Whiting Jacqueline W. Pearce Bruce H. Grahn Charles W. Hamm Cecil P. Moore Kristina L. NarfstrĂśm, Bilateral retinoschisis in a dog: A veterinary clinical application for optical coherence tomograph. Veterinary Ophthalmology, Early View. First published: 8 March 2018 https://doi.org/10.1111/vop.12557
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