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RUSVM Pathology I > Dermatitis > Flashcards

Dermatitis Flashcards

1
Q

Dermatitis is under what pathological process?

A

Inflammation and repair

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2
Q

A dermatitis that is superlative/pustular/exudation/neutrophilic is due to?

A

Bacterial

Auto-immunity

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3
Q

Dermatitis that is proliferative is due to?

A

Virus

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4
Q

Dermatitis that is vesicular is due to ?

A

Viral

Auto-immunity

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5
Q

A dermatitis that is granulomatous is due to

A

Mycobacteria
Fungal
Foreign substance

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6
Q

A dermatitis that is eosinophilic is due to

A

Allergy

Parasites

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7
Q

A dermatitis that are at the dermal-epidermal junction (interface) is due to

A

Auto-immunity

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8
Q

Pus in the skin is called

A

Pyoderma

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9
Q

Pyoderma that is superficial in the epidermis and the hair follicles can be due to what diseases?

A

Canine superficial spreading pyoderma/ bacterial folliculitis

Impetigo (pustular)

Greasy pig disease (staph hyicus)

Dermatophilosis

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10
Q

A deep pyoderma within the dermis can be due to what diseases

A

Bacterial furunculosis (eg dog with chin acne

Abscesses

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11
Q

What are predisposing factors for bacterial infection of skin

A

Disorders of keratinization

  • endocrine disease
  • chronic dermatitis -allergy or parasite

Immunodeficiency

Anatomical predisposition

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12
Q

What features of dogs skin makes bacterial infection common?

A

Thin stratus corneum
Lack of lipid seal of hair follicles
High skin pH

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13
Q

What is the most common bacteria infection skin

A

Staphylococcus spp

-produce exfoliating toxins that cause intraepidermal splitting

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14
Q

Non-follicular pustules which develop into crust often seen in prepubescent puppies

A

Impetigo

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15
Q

Skin fold pyoderma, where apposed surfaces cause frictional trauma leading to opportunistic bacterial infections

A

Intertrigo

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16
Q

In a dog you see..

Moist, alopecia, sightly raised well-circumscribed lesions with ulceration/crusting

A

Pyotraumatic dermatitis (hot spots)

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17
Q

What is the cause of potraumatic dermatitis?

A

Self trauma -> bacterial infection

-> underlying puritans (eg flea allergy dermatitis)

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18
Q

In a pig you see…

Erythema, pustules, crust

A

Greasy pig disease (exudation dermatitis)

Caused by staphylococcus hyicus

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19
Q

What are predisposing factors of greasy pig disease?

A

Other skin lesions, poor nutrition/husbandry, lacerations

This can be fatal in neonatal pigs

20
Q

You see on your cows and your sheeps..

Pustules, exudate, matted hair/wool, and alopecia on their backs and distal extremities

A

Dermatophilosis

21
Q

What are predisposing factors to dermatophilosis ?

A

Wet weather/humid climate (rain rot)

-prolonged wetting skin allows penetration of epidermis by zoospores

22
Q

Dermatophilosis is caused by???

A

Dermatophilus congolensis

Gram + filamentous bacteria
Train track appearance

23
Q

In a dog you see..

Scaling, erythematous macules, papules, crusts, epidermal collarettes, and alopecia

A

Canine superficial spreading pyoderma

24
Q

What is your DDX for canine superficial spreading pyoderma?

A

Dermatophytosis (ring worm)

Demodicosis

25
Q

What diagnostics would help you differentiate dermatophytosis vs demodicosis ?

A 
Cytology of pustule/crust 
-neutrophils with cocci 
Woods lamp -> ringworm with fluorescence 
Fungal culture 
Skin scraping -> demodex
26
Q

Demodicosis is caused by

A

Demodex spp mite

27
Q

What two forms of demodex can dogs have

A

Localized - face and forelegs (usually in young dogs, self traumatizing)

Generalized (adult onset- associated with systemic disease/neoplasia/endocrinpathy/immunosuppressive therapy)

28
Q

Dermatophytosis is caused by?

A

Keratinophylic fungi

  • Epiermophyton
  • Microsproum
  • Trichophyton spp
29
Q

How do animals get a dermatophytosis infection

A

Contagious- aquired by contact with scales shed from infected animals

30
Q

What are predisposing factors do dermatophytosis infections

A

Young or immunosuppression
Hot/humid environments

Self-limiting disease in healthy animals

31
Q

Dog with pustular/exudative dermatitis

What is the pathological process and the most likely causes?

A

Inflammatory

DDX:
Bacterial eg. Staphylococcus
Fungal
Auto-immune

32
Q

What is a group of autoimmune diseases involving type II hypersensitivity against cell adhesions proteins

A

Pemphigus

33
Q

What is the most common/milder form of pemphigus

A

Pemphigus foliaceous

34
Q

Pemphigus foliaceous..
where is is usually localized?
What are the lesions?
What is it caused by?

A

Face, ears, footpads, and clawbeds

Vesicles, pustules, crusts, and ulcers

Spontaneous, drug-induced, or allergic skin disease

“Foliaceous feet face” - Dennis

35
Q

Pigs
Solid elevations less than 1cm

What pathological process dies this belong to and what is your DDX?

A

Disturbance of growth

Inflammatory

36
Q

Histopathology of a papule on a pig shows proliferative dermatitis with ballooning degeneration and intracytoplasmic inclusion bodies.

What is the most likely diagnosis ?

A

Swine-pox infection

37
Q

What is the sequence of lesions that arise due to pox viruses?

A

Macule -> papule -> vesicle -> umbiliated pustule -> crust

38
Q

What gene do pox viruses contain that leads to epidermal hyperplasia

A

Epidermal growth factor

39
Q

You have some livestock in your backyard and you see…

Lameness, anorexia, ptylasm… you investigate further cause thats just the kind of doctor you are…

You find ulcers on their feet, bullas/ulcers in their mouths

What pathological process is this and what’s your DDX?

A

Degeneration and necrosis
Inflammatory

Virus

  • herpes
  • pox
  • vesicular diseases (FMD, VSV, SVD, and VES)
40
Q

How do you differentiate a DDX between a group of viruses?

A

Lab testing

41
Q

FMD virus infects what sp?

A

Cattle, pigs, wildlife

42
Q

VSV virus infects what hosts

A

Cattle, pig, horse, llama

43
Q

SVD virus infects what hosts?

A

Pigs, feral swine

44
Q

VES infects what hosts?

A

Pigs

Fish and marine mammals

45
Q

Cat with vesicular dermatitis on the face

Pustular/vesicular/dermatitis/cheilitis/rhinitis

A

feline herpes virus 1

Could be calcivirus-> look for ulcers on the tongue)

46
Q

Pseudo-lumpy skins disease is a vesicular-ulcerative dermatitis due to what virus?

A

Bovine herpes virus 2

47
Q

Cows with vesicular-ulcerative mammilities is due to what virus?

A

Bovine herpes virus 2

RUSVM Pathology I (17 decks)

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