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Image:Microsporum equinum.jpg|<center><p>'''Microsporum equinum'''</p><sup>Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath</sup></center></gallery>
 
Image:Microsporum equinum.jpg|<center><p>'''Microsporum equinum'''</p><sup>Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath</sup></center></gallery>
 
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[[Image: Microsporum canis lesions.jpg|100px|thumb|right|<small><center>''Microsporum canis'' alopecia and scaling lesions (Courtesy of Bristol BioMed Image Archive)</center></small>]]
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[[Image: Ringworm dog.jpg|100px|thumb|right|<small><center>Ringworm in a dog (Courtesy of Bristol BioMed Image Archive)</center></small>]]
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[[Image: Trichophyton mentagrophytes dog.jpg|100px|thumb|right|<small><center>Trichophyton mentagrophytes in a dog (Courtesy of Bristol BioMed Image Archive)</center></small>]]
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*Caused by [[Fungi|dermatophytes]]
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**''Microsporum'' - zoophilic
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**''Trichophyton'' - geophilic
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**''Epidermophyton'' - anthropophilic
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*Common in many species, especially cats
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*Hot, humid environment predisposes and viable fungi peripherally
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*More common in young animals
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*Produce proteolytic enzymes to penetrate surface lipid
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*Fungal hyphae invade keratin -> break into arthrospores
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*Epidermal hyperplasia ([[Skin Glossary - Pathology|hyperkeratosis, parakeratosis, acanthosis]]) and inflammation
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*Superficial perivascular dermatitis -> exocytosis (migration through epidermal layers) -> intracorneal microabscesses
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*Exocytosis -> folliculitis -> furunculosis
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*Highly variable lesions
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*Normal -> eruptive nodular -> pseudomycetoma -> onychomycosis
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*Grossly:
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**Circular or irregular lesion, may coalesce
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**Scaly to crusty patches
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**Alopecia due to broken hair shafts and hairs lost from inflammed follicles
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**Follicular papules and pustules
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**Peripheral red ring ('''ringworm''') due to dead fungi in areas of inflammation at centre of lesions and viable fungi peripherally
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*Microscopically:
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**Perifolliculitis, folliculitis or furunculosis
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**Epidermal hyperplasia
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**Intracorneal microabscesses
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**Septate hyphae or spores may be found in stratum corneum and keratin of hair follicles
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[[Category:Fungi]]
 
[[Category:Fungi]]
 
[[Category:To_Do_-_Fungi]]
 
[[Category:To_Do_-_Fungi]]
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