uvea and uveitis - in focus cases in dogs, 8 ... (70% of l/p uveitis submissions have glaucoma also)...
TRANSCRIPT
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Uvea and UveitisCL Davis 9/08
Richard R Dubielzig
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Blastomycosis142 cases in dogs, 8 cases in cats
• Blastomyces dermatitidis• Dogs more than cats• Mississippi River valley • Very local hotbeds• Soil fungus spread through inhalation from
the soil• Encapsulated with broad-based budding
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Blastomycosis
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Cryptococcosis19 cases in dogs, 22 cases in cats
• Cryptococcus neoformans• Spread from soil rich with pigeon droppings• Ohio River valley• Cats more than dogs• 7 to 10 micron poorly staining cell body
surrounded by mucinous capsule
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Cryptococcosis
Alcian Blue PAS
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Alcian Blue PAS
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Coccidioidomycosis24 cases in dogs, 9 cases in cats
• Coccidioides immitis• Soil organism from Southwestern desert• Infects many species• Organism easier to find in cats than dogs• 20 to 40 micron spherule with enclosed
endospores• Does not have a budding form
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Coccidioidomycosis
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Histoplasmosis2 cases in dogs, 20 cases in cats
• Histoplasma capsulatum• Found in soil contaminated with bird
droppings• Affects many tissues• Ohio River valley• 4 micron intracellular organism
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Histoplasmosis
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Protothecosis8 cases in dogs, 0 in cats
• Prototheca zopfii, Prototheca wickerhamii• Saprophytic achlorophyllus algae• Worldwide distribution infecting several
species• Associated with contaminated water and
susceptible host
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Protothecosis
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Uveitis Organisms
• Blastomycosis• Cryptococcosis• Coccidioidomycosis• Histoplasmosis• Protothecosis• Aspergillosis
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Canine Systemic Aspergillosis
• Worldwide distribution• German Shepherd breed at risk• Systemic disease with vasculitis• Poor prognosis
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Systemic Aspergillosis
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Canine Ocular Larval MigransToxocara canis
• Affects young working dogs with a high exposure rate
• Nonspecific inflammation with focal granuloma– Important to block-in the
granulomas
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Two Year-old Blind Dogs
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Equine Recurrent Uveitis (ERU)• Bilateral, but not always symmetrical • Cyclic Uveitis• Etiology
– Leptospirosis– Autoimmunity
• Classic morphologic features– Lymphoplasmacytic inflammation with lymphoid follicles– Lymphocytes within the ciliary epithelium– Linear hypereosinophilic cytoplasmic inclusions in the non-
pigmented ciliary epithelium– Amyloid deposition on the inner surface of the non-pigmented
ciliary epithelium
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Pinealitis
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West Nile Virus in Raptors
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Diplostomum spathaceum
Trematode Parasite of Fish Eyes
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Canine Uveodermatologic Syndrome
Vogt-Koyanagi-Harada SyndromeVKH
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Canine Uveodermatologic SyndromeVogt-Koyanagi-Harada Syndrome
VKH
• 86 cases in the COPLOW collection• Breeds
– Akita...23– German Shepherd...8– Chow Chow...4– Northern Breeds...Underrepresented*
• Bilateral symmetry is a distinctive feature• Glaucoma• Retinal detachment• Morphologically, relatively quiet eye
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CanineVKH
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Canine “Asymmetric Uveitis”82 cases
Poodles, Schnauzers and Min Pinscher, Dachshunds overrepresented
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AsymmetricUveitis
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VKH vs Asymmetric Uveitis
• Extent and distribution symmetrical
• Simultaneous involvement of both globes
• Depigmentation• Quiet eye
• Asymmetrical extent and distribution of disease
• One eye usually removed first
• No depigmentation• Marked inflammation
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Canine Granulomatous Scleritis
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Canine Granulomatous ScleritisNecrotizing scleritis
• The disease is defined by the scleral predilection
• You may see granulomatous uveitis, like VKH
• You may see episcleritis, like NGE
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GranulomatousScleritis
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Scleritis with Ectasia
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Feline Lymphoplasmacytic Uveitis(L/P Uveitis)
• 886 cases out of 3,960 total feline cases (22%)• Second most common disease associated with glaucoma in the
COPLOW pathology collection (70% of L/P uveitis submissions have glaucoma also)
• There is vitreous degeneration that is underemphasized in this disease
• About 10% have lens protein in the anterior vitreous, secondary to rupture/leakage at the level of the posterior pole
• Many possible causes have been studied or suggested, but the cause is surely nonspecific and multifactorial
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Alcian Blue PAS
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Lens Protein
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