Veterinary Dermatology: Hair Disorders and More

Questions and Answers

What is the term for the absence of hair?

Hypotrichosis

Alopecia (correct)

Epitheliogenesis Imperfecta

Collagen dysplasia

Hypotrichosis makes animals less susceptible to sunburn and infections.

False

What is the primary consequence of Epitheliogenesis Imperfecta?

Failure of the stratified squamous epithelium to develop completely.

Photodynamic substances activated by UV light can lead to __________.

Photosensitization Signup and view all the answers

Which type of photosensitization has an exogenous origin of photodynamic agents?

Type I Signup and view all the answers

Match the skin injury type with its description:

Chemical Injury = Local application causing skin damage Physical Injury = Abrasion, laceration, or ulcers Sunburn = Direct endothelial damage and inflammation Psychogenic Dermatitis = Caused by persistent licking or chewing Signup and view all the answers

What common psychological factor can contribute to psychogenic dermatitis in pets?

Boredom or anxiety. Signup and view all the answers

Solar dermatitis leads to immediate blistering after sunburn.

False Signup and view all the answers

Which type of infectious skin disease is caused by poxviruses?

Viral skin disease Signup and view all the answers

Viral skin diseases can only enter the animal body via trauma to the epidermal surface.

False Signup and view all the answers

Name one common viral skin disease affecting sheep and goats.

Contagious Pustular Dermatitis Signup and view all the answers

Canine distemper is an example of a __________ viral infection with skin involvement.

systemic Signup and view all the answers

Match the following viruses with their corresponding hosts:

Papilloma virus = Horses Bovine mammillitis virus = Cattle Contagious ecthyma = Sheep and goats Canine distemper virus = Dogs Signup and view all the answers

What is the primary cause of mortality in young animals affected by Contagious Pustular Dermatitis?

Systemic disease Signup and view all the answers

Superficial Pyoderma is characterized by erythematous dermatitis with crust formation.

False Signup and view all the answers

What is the common name for the lesions that occur in the late stages of Contagious ecthyma?

Scabby mouth Signup and view all the answers

Study Notes

Alopecia and Hypotrichosis

Alopecia refers to the complete absence of hair, while hypotrichosis indicates a reduced amount of hair.
Animals with hypotrichosis are at a higher risk for sunburn, temperature extremes, and infections (bacterial and fungal).

Collagen Dysplasia

A disorder affecting connective tissue characterized by hyperextensibility and laxity.

Epitheliogenesis Imperfecta (Aplasia Cutis)

Results from incomplete development of the stratified squamous epithelium in skin, adnexa, or oral mucosa.

Environmental Induced Skin Diseases

Include sun damage (actinic injury), chemical injuries, and physical injuries.

Sunburn and Solar Dermatosis

Sunburn results in endothelial damage and the destruction of keratinocytes, causing inflammation.
Acute symptoms include erythema, pain, edema, and blistering; chronic symptoms may lead to skin thickening and possible dysplasia or neoplasia.
Commonly affects the ventral abdomen and thorax.

Photosensitization

Triggered by photodynamic substances activated by UV-A or visible light.
Types include:
- Type I: Exogenous agents (toxins/plants).
- Type II: Aberrant endogenous agents.
- Type III: Hepatogenous type due to chlorophyll metabolite accumulation.
- Type IV: Unknown causes.
Affects areas with less pigmentation.

Chemical Injury

Local chemical applications penetrate skin layers, intensified by moisture.
Systemic injuries occur from toxin ingestion affecting the skin and other organs.

Physical Injuries

Types include abrasions, lacerations, ulcerations, foreign bodies, radiation, and temperature extremes.
Feline psychogenic dermatitis arises from neurological factors leading to repetitive licking and resultant trauma.

Infectious Skin Diseases

Divided into viral, bacterial, mycotic, parasitic, and protozoal diseases.

Viral Skin Diseases

Infectious agents enter through trauma to the skin and can involve hair follicles or gland ducts.
Types include local infections and systemic infections with skin involvement.

Local Viral Infections

Poxviruses infect various animals, causing lesions, notably in the mouth area due to abrasions from food.
Contagious Pustular Dermatitis is caused by parapoxvirus, affecting sheep and goats, and can lead to systemic disease and mortality in young animals.

Systemic Viral Infections

Involves epitheliotropic and pantropic viruses with skin implications.
Diagnosis includes clinical signs, skin biopsies for lesions, and serological tests.
Examples include Foot and Mouth Disease (FMD) and Canine Distemper.

Specific Conditions

Scrapie: Also known as mad sheep disease, similar to bovine spongiform encephalopathy (BSE).
Papilloma viruses affect various species (canines, cattle, horses), leading to characteristic skin lesions.

Superficial Pyoderma

Characterized by erythematous dermatitis and the formation of epidermal collarettes.

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Description

This quiz explores various dermatological conditions in animals, focusing on alopecia, hypotrichosis, and their implications. It also touches on connective tissue disorders such as collagen dysplasia and conditions affecting epithelium development. Test your knowledge and understand these crucial aspects of veterinary dermatology.