Thymus

Question 1

Thymic hypoplasia

Answer 1

-SCID
-Perinatal weak calf syndrome in Calves
-Congenital hypotrichosis
-DiGeorge syndrome of humans

Question 2

Thymic hyperplasia

Answer 2

Rare
-Differential for dyspnea in young animals
-Associated with in-utero BLV infection

Question 3

Thymic atrophy

Answer 3

-Parvovirus
-BVDV
-FeLV and FIV
-Porcine repro and resp syndrome
-Classical swine fever
-Canine distemper virus
-Physiologic
-Nutritional
-Endogenous corticosteroids

Question 4

Thymic hematoma

Answer 4

Most common in dogs
-Rodenticides
-Breed associated
-Trauma
-Idiopathic

Question 5

Cat thymic lymphosarcoma

Answer 5

Some FeLV or FIV associated
Most restricted to thymus and regional lymph nodes

Question 6

Dog thymic lymphosarcoma

Answer 6

Middle aged dogs
Associated with multisystemic lymphosarcoma
Hypercalcemia is present sometimes

Question 7

Cattle Thymic lymphosarcoma

Answer 7

Sporadic form
Non BLV associated

Question 8

Neoplastic thymic epithelial cell

Answer 8

Can be benign (thymoma) or malignant (thymic carcinoma)
Not viral associated
See dyspnea, coughing, and regurg
Concurrent paraneoplastic or immune mediated condition: hypercalcemia, immune mediated dermatitis in cats
Most common neoplasia in old goats