Pathology of lymphoid organs

Question 1

What are these lesions and what is their significance?

Answer 1

Siderotic plaques (Iron and calcium deposits + fibrous tissue) - indicental finding

Question 2

Horse Splenomegaly cause?

Answer 2

Barbituates

Question 3

Dog splenomegaly cause?

Answer 3

GDV (torsion)

Question 4

Lesions?

Answer 4

Haematoma

Question 5

Lesion?

Answer 5

Haematoma

Question 6

Lesion?

Answer 6

Organised haematoma

Question 7

Consequenses of haematoma?

Answer 7

rupture of capsule -> haemoperitoneum -> anaemia and hypovolaemic shock

Question 8

Causes of splenitis

Answer 8

Bovine athrax (bacillus athracis)

African Swine Fever

Caseous lymphadenitis

Streptococcus sp -> splenic abcess in dogs

Arcanobacterium pyogens (traumatic reticulo-peritonitis)

Question 9

Hyperplastic diseases of the spleen

Answer 9

Follicular (white pulp) hyperplasia

Nodular hyperplasia

hyperplasia of the monocyte macrophage system

extramedullary haematopoiesis

Question 10

Describe this lesion

Answer 10

multifocal nodular hyperplasia (can’t tell if hyperplasia or neoplasia). May lead to haematoma.

Question 11

Neoplastic Diseases of the spleen

Answer 11

Haemangiosarcoma - go to liver as well

Lymphoma

Histiocytic sarcoma

Mast cell tumours

Sarcomas

Metastatic tumors

Question 12

What is this?

Answer 12

Haemangiosarcoma

Question 13

What is this?

Answer 13

Haemangioma - rare

Question 14

When do you get thymic atrophy /hypoplasia

Answer 14

Equine herpesvirus 4 - lymphocytolysis

Canine and Feline Parvovirus - lymphocytolysis

Severe Combined immunodeficiency - hypoplasia