Lymphoid

Question 1

thymus hypoplasia

SAME for Lymph nodes!

Answer 1

normal - involution

rare, SCID 
lympholysis
- viruses 
- steroids
- nutritional
- toxic

Question 2

thymoma derived from ___ cells.

metastisis? invasion?

Answer 2

epithelial

mets and invasion is NOT common

Question 3

paraneoplastic syndrome of thymoma

Answer 3

acquired autoimmune disorders: myasthenia gravis, polymyositis

miliary dermatitis of cats

Question 4

thymic lymphoma

is invasive?

Answer 4

aggressive, invasive

Question 5

homogenous tan color, bulging, in cranial mediastinum

Answer 5

thymoma or thymic lymphoma

- hard to differentiate without patholgy

Question 6

thymic hemorrhage /hematoma caused by?

Answer 6

trauma, bleeding disorders (rodenticide)

Question 7

architecture of lymph node is maintained in

Answer 7

hyperplasia (reactive node) mix of cells

Question 8

lymphadenitis

Answer 8

red, inflammed, subcapsular sinus filled with neutrophils

Question 9

enlarged nodes in prescap, tracheobronchiole.

differentials?

Answer 9

Think bilateral!
respiratory/oral infection
lymphoma

Question 10

if you cut the spleen and it bleeds its _____. vs. doesnt bleed - ____.

Answer 10

congestion

lymphoma

Question 11

how to tell difference between nodular hyperplasia fromhemangiosarcoma?

Answer 11

• can US and FNA
• if small masses probably nodular
• remove and biopsy only way to tell

Question 12

splenitis caused by

Answer 12

blood borne infection

Question 13

how difficult to tell hematoma from hemangiosarcoma

Answer 13

its impossible to tell grossly

- can help if you look for mets (then you know is malignant)

Question 14

siderotic plaques?

Answer 14

common change INCIDENTAL (just microhemorrhages)

Question 15

acute death in 3 hours

Answer 15

• hemorrhage (slplenic rupture)
• PTE
• toxin ingestion

Question 16

black area of spleen, well demarcated

Answer 16

just more congested there, its incidental

Question 17

dark edges of spleen

Answer 17

incomplete contraction

Question 18

is lymphoma malignant

Answer 18

yes, malignant lymphoma and lymphosarcoma are the same thing

Question 19

most common mediastinal mass in cats and dogs?

Answer 19

cat - lympho(sarco)ma

dog - thymoma

Question 20

how does hypercalcemia of malignancy happen

Answer 20

tumor produces PTH like protein

Question 21

staging vs. grading

Answer 21

staging - clinical, bilateral, multiple organs?

grading - cells, histology, mitotic rate, necrosis, differentiation

Question 22

multicentric lymphoma

Answer 22

multiple organs