Lymphatics

Question 1

Lymphadenomegaly-three processes

Lesions

Answer 1

• hyperplasia, reacting to antigenic stimulation
• lymphadenitis, inflammation of LN itself
• lymphoma
• cytology: high mitosis, large undiff lymphoblastic, homogenous population
• histo: loss of architecture

Question 2

Cat lymphoma forms and ages

Answer 2

-AL is most common, older felv negative cats
-thymi lymphoma: younger cats
Multi centric, renal, extranodal

Question 3

Splenic lesions and causes

Answer 3

• diffuse: lymphoma, mast cell tumor in cats, diffuse hyperplasia (hemolytic parasite), congestion (cirrhosis)
• mass: hemangiosarcoma, hematoma, other oma/sarcomas
• nodules: modular hyperplasia, lymphoma

Question 4

Diff between thymic lymphoma and thymoma with cell origin, signalment, clinical consequences

Answer 4

Thymic lymphoma is tumor of lymphocytes, adult dogs young or old cats, precaval syndrome (face or limb pitting edema).
Thymoma is tumor from epithelial cells, old goats, paraneoplastic syndrome-myasthenia gravis or polymyositis

Question 5

With thymic lymphoma, what’s your primary dfdx with a young cat and then an old cat/dog
Also, why the precaval syndrome

Answer 5

Young cat-felv associated thymic lymphoma
Old cat/dog-thymic lymphoma
Precaval syndrome-tumor press against caudal vena cava, decrease blood flow, blood stasis, congestion?