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| − | [[Seborrhea]] | + | #REDIRECT[[:Category:Integumentary System - Pathology]] |
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| − | ===[[Sebaceous Adenitis]]===
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| − | ==Pigmentation disorders==
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| − | ===Hypopigmentation===
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| − | *Leukoderma or vitiligo - loss of pigment in the skin
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| − | *Leukotrichia - loss of pigment of the hair
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| − | *Hypopigmentation or incomplete albinism - generalised reduction of pigment in skin or hair
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| − | *Albinism - inherited lack of pigment
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| − | *Dilution - reduced pigmentation
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| − | *Can be localised or generalised, idiopathic or asociated with other diseases
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| − | *Examples of hereditary conditions: Maltese dilution of cats, Chediak-Higashi syndrome, leukoderma and leukotrichia of Dobermans, Arabian fading syndrome
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| − | *Asociated with some immune-mediated disorders, ''e.g.'' [[Discoid Lupus Erythematosus|discoid lupus erythematosus]]
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| − | [[Category:Integumentary System - Pathology]]
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| − | ===Hyperpigmentation===
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| − | [http://w3.vet.cornell.edu/nst/nst.asp?Fun=Image&imgID=1782 Image of endocrine hyperpigmentation from Cornell Veterinary Medicine]
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| − | *Results from irritation or inflammation, pigmented neoplasms or [[Endocrine effects on the skin - Pathology|metabolic diseases]]
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| − | *Lentigo - circumscribed macular or slightly raised plaque with epidermal hyperplasia and hyperpigmentation
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| − | [[Category:Integumentary System - Pathology]]
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| − | ==Eosinophilic infiltration==
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| − | ===Eosinophilic plaques===
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| − | *Common in cats
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| − | *Medial thighs and abdomen mostly involved
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| − | *Often associated with hypersensitivity
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| − | *Grossly:raised plaques, erythematous, pruritic, erosed or ulcerated
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| − | *Microscopically: acanthosis, spongiosis, erosions or ulceration, predominantly eosinophilic dermatitis, possibly areas of collagen degeneration
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| − | [[Category:Integumentary System - Pathology]]
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| − | ===Eosinophilic granulomas===
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| − | *Involves cats, dogs, horses
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| − | *Collagen degeneration in lesions os eosinophil degranulation
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| − | *Often involved in reaction to parasites, foreigh bodies or mas cell tumours
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| − | *Grossly:
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| − | **Papules, nodules, plaques, ulcers in skin
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| − | **Nodules or ulcers in oral mucosa of cats and dogs or on foot pads of cats
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| − | *Microscopically:
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| − | **Nodular dermatitis or stomatitis
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| − | **Fragments of degenerated collagen surrounded by eosinophils and macrophages
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| − | [[Category:Integumentary System - Pathology]]
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| − | ===Eosinophilic folliculitis and furunculosis===
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| − | *Rare in cats, dogs, cattle and horses
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| − | *Possibly due to arthropod bites
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| − | *May be multifocal in horses
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| − | [[Category:Integumentary System - Pathology]]
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| − | ==Sterile granulomatous disorders==
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| − | ===Juvenile pyoderma===
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| − | *Also known as '''Juvenile sterile granulomatous dermatitis and lymphadenitis, juveline cellulitis, puppy strangles'''
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| − | *Involves dogs of less then 4 months of age
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| − | *Grossly: pustular and nodular dermatitis with oedema involving the face, ears, mucocutaneous junctions
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| − | *Microscopically: granulomatous or pyogranulomatous perifolliculitis, paniculitis and dermatitis
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| − | [[Category:Integumentary System - Pathology]]
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| − | ===Equine generalised granulomatous disease===
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| − | *Also known as '''Sarcoidosis'''
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| − | *In horses
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| − | *Rare
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| − | *Involves cutaneous lesions and systemic disease causing anorexia and weight loss
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| − | *Grossly: alopecia, scales, crusts, sometimes nodules and masses
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| − | *Microscopically: multifocal granulomas, multinucleated giant cells
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| − | [[Category:Integumentary System - Pathology]]
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