Neoplastic Skin Diseases Flashcards

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1
Q

What are the four classifications of skin tumours?

A

Epithelial
Spindle cell
Round cell
Melanocytic

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2
Q

Why may a papilloma regress?

A

May regress spontaneously due to cytotoxic immune response

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3
Q

What are the characteristics of tumours of the hair follicles?

A

Most often solitary, benign, slow growing masses in older animals

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4
Q

List four types of sebaceous gland masses

A

Sebaceous hyperplasia
Sebaceous adenoma
Sebaceous adenocarcinoma
Sebaceous cysts

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5
Q

What paraneoplastic change may an anal sac apocrine gland tumour cause?

A

Paraneoplastic hypercalcaemia

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6
Q

Which species are fibromas mostly seen in?

A

Cats

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7
Q

List the causes of fibrosarcomas in young and old cats?

A

Young cat - feline sarcoma virus/feline leukaemia virus (multicentric)
Old cat - injection sites (solitary)

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8
Q

What is the most common equine skin tumour and what is it caused by?

A

Sarcoid - bovine papilloma virus

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9
Q

What are the histopathological features of sarcoids?

A

Hyperplastic epidermis - whorls and bundles of collagen/fibroblasts

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10
Q

What is the most common dog skin tumour and what age of dogs are they seen in?

A

Histiocytoma - young dogs (2-4 years)

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11
Q

What do histiocytomas look like?

A

Strawberry buttons - solitary, raised, benign

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12
Q

What are the histopathological features of a histiocytoma?

A

Sheet macrophage-like cells, dendritic Langerhans cells, highly mitotic and lymphoid infiltrate at the base.

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13
Q

In which horses and what is the age of horses that equine melanomas are most commonly seen?

A

Grey horses > 6 years

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