80. Tumors of vascular tissues (blood and lymph vessels)

Question 1

Hemangioma

Answer 1

 Mesenchymal origin
 Benign tumor of vessels’ endothelium and
progenitor cells
 Frequent in dogs, rare in other species

Question 2

Lymphangioma

Answer 2

 Benign tumor of lymphatic vessles (?)
 Malformation in current classification, not neoplasia
Mostly cystous lesion, contains serous or serohemorrhagic fluid

Question 3

Hemangiosarcoma

Answer 3

 Malignant tumor of blood vessel endothelium
 Dogs: right auricle, spleen, liver, lungs, skin, subcutis, urinary bladder subserosa, kidney subcapsularly
 Metastasis

Question 4

Perivascular wall tumors (PWTs)

Answer 4

A group of tumors, including:
* hemangiopericytoma
* myopericytoma
* angioleiomyoma
* angiomyofibroblastoma
* angiofibroma
 Benign tumors of pericytes and adventitia