[B] 1.81 Tumors of vascular tissues (blood and lymph vessels)

Question 1

Tumours of vascular tissues: Classification

Answer 1

• Benign angiomas
• Malignant angiosarcomas
• Perivascular vessel wall tumours

Question 2

Benign angiomas

Answer 2

• Haemangioma (Capillary, cavernous, arteriovenous, spindle cell)
• Lymphangioma (Simple, cavernous, cystic)
• Lymphangio-haemangioma

Question 3

Malignant angiosarcomas

Answer 3

• Haemangiosarcoma
• Lymphangiosarcoma

Question 4

Perivascular vessel wall tumours

Answer 4

• Perivascular wall tumour
• Myopericytoma

Question 5

Haemangioma

Answer 5

• Mesenchymal origin
• Neoplasm of endothelium and progenitor cells of blood vessels
• Congenital/acquired
• Cutaneous/visceral
• Solitary/multiplex
• Functionally malignant

Question 6

Haemangioma: Development

Answer 6

Mast cells

• Angiogenic factors help

Question 7

Lymphangioma

Answer 7

Benign tumour of lymph vessels

Question 8

Haemangiosarcoma

Answer 8

• Malignant tumour of the blood vessel endothelium
• Solitary/multiplex
• Dogs: Right auricle, Spleen, skin, subcutis, liver, lungs, bladder
• Metastatic

Question 9

Perivascular wall tumour (PWT)

Answer 9

• Formerly haemangiopericytoma
• Benign tumour of pericytes
• Older, large dog breeds
• Usually on limbs, solitary