Tumours of the skin

Question 1

What is the most common site of tumours for dogs?

Answer 1

• The skin

Question 2

Squamous cell carcinoma is a malignant tumour and a result of ___(1)_____. Its behaviour is that it is locally invasive and ___(2)__ to metastasise. In cats the most common site is the ___(3)___. In dogs SCC are the most common neoplasm of the ___(4)__.

Answer 2

1. Excessive sun exposure
2. Slow
3. Head
4. Digit

Question 3

For papilloma’s:

1. State whether they are benign or malignant
2. What is the cause?
3. How are they transmitted?
4. What is the signalment of dog affected?
5. Should they be removed?
6. What is the appearance?

Answer 3

1. Benign
2. Species specific papilloma viruses
3. Direct + indirect contact
4. Young dogs
5. No - usually regress in ~ 3 months
6. White plaques/Cauliflower lesions

Question 4

Given the signalment of a 3 year old whippet what tumour is most likely in the dog below”

Answer 4

Papilloma most likely

Question 5

Are lipomas seen more commonly in cats or in dogs?

Answer 5

• Mostly seen in dogs - much rarer in cats (found on thorax abdomen and limbs)

Question 6

What is the propensity of sebaceous gland adenocarcinomas to metastasise?

Answer 6

Very rarely metastasise

Question 7

For mast cell tumours:

1. State whether they are malignant or benign?
2. What is the cause?
3. What are some systemic complications that can occur as a result?

Answer 7

1. Malignant
2. Result of p53 + C-KIT mutation
3. Gastric ulcers and coagulopathies occur as a result of mast cell granule release

Question 8

Name the most likely tumour in the Boxer below given that gastric ulcers were also found in this animal:

Answer 8

Mast cell tumour

Question 9

For cutaneous histiocytoma:

1. Is it benign or malignant?
2. What cell is it a tumour of?
3. Are dogs are cats more affected by them?
4. Describe their appearance and distribution
5. Should they be removed?

Answer 9

1. Benign
2. Tumour of Langerhans cells
3. Mostly dogs
4. Head, pinna and limbs
5. Often regress spontaneously

Question 10

What is the name of the tumour that is shown below given it is benign and in a puppy?

Answer 10

Cutaneous histiocytoma

Question 11

What are the causes of fibrosarcoma’s in felines?

Answer 11

• Young cat - feline sarcoma virus
• Vaccines - Rabies and FeLV are most associated

Question 12

Are most basal cell tumours malignant or benign?

Answer 12

• Most basal cell tumours are benign

Question 13

For cutaneous lymphoma:

1. Are they malignant or benign?
2. What is the origin?

Answer 13

1. Malignant
2. T lymphocytes

Question 14

What is the proper name for a skin tag?

Answer 14

Fibrovascular papilloma