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Related Experiment Videos

Pupillotonia in a dog.

P A Gerding, A H Brightman, J D Brogdon

    Journal of the American Veterinary Medical Association
    |December 1, 1986
    PubMed
    Summary

    A German Shepherd Dog diagnosed with pupillatonia, a condition affecting the iris sphincter muscle, highlights this rare parasympathetic denervation in veterinary medicine. This case demonstrates Adie's tonic pupil in a non-human species, aiding veterinary diagnosis.

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    Area of Science:

    • Veterinary Ophthalmology
    • Canine Neurology

    Background:

    • Anisocoria, or unequal pupil size, is a common clinical sign in veterinary patients.
    • Parasympathetic denervation of the iris sphincter muscle can lead to pupillary abnormalities.

    Observation:

    • A 5-year-old German Shepherd Dog presented with anisocoria.
    • Clinical examination revealed signs consistent with parasympathetic denervation of the iris.

    Findings:

    • The dog was diagnosed with pupillatonia, a condition analogous to Adie's tonic pupil in humans.
    • Diagnosis was confirmed by measuring pupillary aperture changes after topical 0.1% pilocarpine administration.

    Implications:

    • This case expands the understanding of pupillatonia in non-human species.
    • Veterinarians should consider pupillatonia in the differential diagnosis of anisocoria in dogs.