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hematopoiesis shift
yolk sac → liver and spleen → bone marrow
neutrophils
WBC w a short lifespan, often the 1st indicator of bone marrow issues.
Hematopoiesis
lipolysis + myeloid (BM) expansion in residual red (hematopoietic) marrow
BM will appear red if active
Extramedullary hematopoiesis (EMH)
The production of blood cells outside of the bone marrow, primarily in the spleen.
Myelofibrosis
The fibrosis/scarring of the bone marrow, leading to peripheral cytopenias and decreased production of blood cells.
Regenerative anemia
caused by hemorrhage or hemolysis
leading to erythroid hyperplasia
Non-regenerative anemia
caused by infection, toxins, mediations, estrogens, CKD, Fe deficiency or cancer
resulting in a erythroid hypoplasia or aplasia
Gelatinous transformation
replacement of bone marrow adipose tissue with mucinous material, seen in cases of emaciation or starvation.
Aplastic anemia
Anemia affecting all cell lines, characterized by necrosis of the bone marrow and a decreased ability to produce blood cells.
Equine infectious anemia
An infectious disease that can cause immune-mediated thrombocytopenia.
Ehrlichiosis
An infectious disease that can cause immune-mediated thrombocytopenia and non-neoplastic lymphocytosis in dogs and cats.
Acute leukemia
characterized by poorly differentiated cells, aggressive clinical course, and high blast cell count (>20%) in the bone marrow or blood.
Homogenous expansion
associated w a neoplastic process
Heterogenous expansion
associated w a reactive process
Multiple myeloma
cancer that affects plasma cells in the bone marrow
Trend Fat:Hematopoietic cells in BM
fat increases w age, while hematopoietic cells decrease
w age, BM goes from red/active → yellow/fatty/inactive
1:1
myeloid:erythroid in nx BM
CBC
essential for diagnosis of hematologic disturbances
areas where hematopoietic marrow is concentrated in adults
spine, pelvis, sternum, ribs, calvarium and proximal end of limb bones
horses
do not release retics into circulation
cant use retics to determine if regen or nonregen anemia
dog
spp that have apparent central areas of pallor
can be used to determine RBC damage
spp order of longest to shortest mean RBC lifespan
horses & cattle → dogs → cats
mechanism for myelofibrosis
scar formation after necrosis
high concentration of growth factors w marrow injury or activation
idiopathic
causes of bone marrow necrosis leading to myelofibrosis
leukemias
infiltrative metastatic neoplasia
BVDV, E. canis, FeLV
sepsis
drugs or toxins
irradation
chronic hemolytic anemia
main lesion of serous atrophy of fat
gelatinous transformation
clinical abnormalities seen w regenerative anemia caused by hemorrhage
iron deficiency (w chronicity)
decreased protein concentration
increased BUN relative to creatinine if there’s a GI bleed
clinical abnormalities seen w regenerative anemia caused by hemolytic anemia
icterus
hyperbilirubinemia
hemoglobinuria
splenomegaly
clinical abnormalities seen w nonregenerative anemia w pure red cell aplasia
pale mm
hypoxic
weak, exercise intolerance
tachycardia, murmurs
+/- lymphocytosis, plasmacytosis, thrombocytosis, myeloid hyperplasia
clinical abnormalities seen w nonregenerative anemia w aplastic anemia
Pale mm
Hypoxic
Weak, exercise intolerance
Tachycardia, murmurs (bc decreased blood viscosity)
Secondary infxns
Neutropenia (1wk post insult)
Hemorrhages
Thrombocytopenia (2 wk post insult)
causes of aplastic anemia in dogs and cats
antimicrobial agents
chemotherapeutic agents
estrogen
phenylbutazone
aflatoxin B
ehrlichia
parvo
FeLV/FIV
causes of aplastic anemia in cattle and sheep
bracken fern
trichloroethylene
aflatoxin B
causes of aplastic anemia in horses
aflatoxin B
EIA
causes of non-neoplastic lymphocytosis in dogs and cats
age/antigenic stimulation
epinephrine
chronic inflammation
E canis infxn
hypoadrenocorticism
paraneoplastic lymphocytosis
hyperthyroidism
CD34 expression on flow
acute leukemia
>20%
amount of blast cells in blood or BM for acute leukemia
necropsy findings of acute leukemia
pale mm
BM highly cellular but pancytopenia
splenomegaly
LN involvement
can infiltrate many organs
CD21 expression on flow cytometry
CLL/SLL (B cell chronic lymphocytic leukemia/small cell lymphocytic lymphoma)
>5000
neoplastic cells/uL in peripheral blood for diagnosis of chronic leukemia
clinical abnormalities for chronic leukemia
Often incidental lymphocytosis
Anemia not uncommon (usually mild)
Other cytopenias usually NOT present
May be well differentiated cells (look like mature cells)
CD4 (T cell)
most common chronic leukemia phenotype in cats
chronic leukemia necropsy findings
splenomegaly
anemia
lymphadenopathy
highly cellular BM
boxers
breed associated w worse prognosis w B cell chronic lymphocytic leukemia
benefits of using flow in cases of lymphocytosis in dogs and cats
large # of Ags can be evaluated
distinguishes homogenous from heterogenous expansions
identifies aberrant Ag expression
objective measure of size
provides prognositic info
clinical abnormalities that can be seen w multiple myeloma
hyperglobulinemia
hypercalcemia
pancytopenia
clinical abnormalities of EIA (equine infectious anemia)
Fever, depression, LN enlargement, splenic congestion
hemolytic crisis: pale w mucosal hemorrhage and dependent edema
Icterus
Splenomegaly
clinical abnormalities of BVDV
thrombocytopenic hemorrhagic syndrome
severely thrombocytopenic and neutropenic w multisystemic hemorrhages
canine distemper virus
causes atrophy and necrosis of bone lining and BM cells
feline leukemia virus (FeLV)
disrupts nx hematopoiesis by inducing genetic mutations, infecting hematopoietic cells
viral diseases in dogs and cats that can affect the thymus
parvovirus
canine distemper virus
feline immunodeficiency
viral diseases that affect the thymus in horses, cattle, and pigs
equine herpes virus -1
bovine viral diarrhea virus
porcine circovirus-2
postweaning multisystemic wasting syndrome
caused by porcine circovirus-2
affect of porcine circovirus-2 on LNs
enlarged, Lymphoid depletion of follicles and paracortex → replacement by granulomatous inflammation
affect of porcine circovirus-2 on thymus
(atrophy) to granulomatous inflammation w multinucleated cells w cytoplasmic viral inclusions
bovine viral diarrhea virus
causes thymic atrophy in cattle
epithelial cells
neoplastic cell of a thymoma
paraneoplastic syndromes that can be seen w a thymoma
myasthenia gravis and megaesophagus
lymphocytosis
exfoliative dermatitis
differentials for a cranial mediastinal mass
neuroendocrine tumor
lymphoma
hemagiosarcoma
thymoma
virus
only associated w lymphoma in cats, no other spp
younger animals
typical age associated w lymphoma, except for dogs
non-neoplastic causes of diffuse, SOFT enlargement of the spleen
gastric volvulus w splenic entrapment
splenic volvulus/torsion
barbiturate euthanasia, anesthesia, or sedation
acute hyperemia (septicemia)
acute hemolytic anemia
congestion
diffuse, soft enlargement of the spleen occurs w
anthrax
primary dz of cattle and sheep
sequence of events causing anthrax
Spores are ingested, replicate in the GI tract, spread to LNs
Disseminate through bloodstream causing septicemia → congestion
Intravascular free bacilli
can be seen on impression smears of the spleen or blood in anthrax
causes of diffuse, FIRM enlargement of the spleen
chronic hemolytic anemia
diffuse granulomatous disease
neoplasia
extramedullary hematopoiesis
storage dz or amyloidosis
infiltrative dz
splenomegaly w FIRM consistency is due to
differentials for SOFT/bloody nodules in the spleen
hematomas
incomplete contraction
hemorrhagic infarction
hemangiosarcoma
differentials for FIRM nodules in the spleen
lymphoid and complex nodular hyperplasia
granulomas or abscesses
primary or metastatic neoplasia
extramedullary hematopoiesis
endothelial cell
neoplastic cell of hemangiosarcomas
golden retrievers, german shepherds, and labs
breeds commonly affected by hemangiosarcoma
spleen, heart (right auricle) and liver
most common primary sites of hemangiosarcoma
quick hemorrhage
cause of (lack of) clinical signs in hemangiosarcoma
bacterial causes of granulomatous disease in the spleen
Mycobacteriosis
Tularemia
Yersiniosis
Brucellosis
fungal causes of granulomatous disease in the spleen
Blastomycosis
Histoplasmosis
Coccidiodosis
Sporotrichosis
protozoal cause of granulomatous disease in the spleen
Toxoplasmosis
Neosporosis
viral cause of granulomatous disease in the spleen
FIP
pyogenic bacteria that cause abscesses or pyogranulomas in the spleen
Streptococcus
Rhodococcus
Trueperella
Corynebacterium
Bernese Mountain Dog, Golden Retrievers, Rottweilers, flat-coated retrievers
breeds commonly affected by histiocytic sarcoma
macrophages of spleen and bone marrow
cell of origin of hemophagocytic histiocytic sarcoma
siderotic plaques
Rough, brown to yellow plaques along the serosal surface
Histo see mineralization and pigment from heme breakdown
Paracortex of LN
Mainly T cells and fewer macs and DCs
Medulla of LN
macrophages (CD204), lymphs and plasma cells
Cortex of LN
B cells
Yorkshire Terriers and Norwegian Lundehund
breeds commonly associated w enteric lymphangiectasia
white spots
corresponds to villous expansion by lacteal dilation in enteric lymphangiestasia
enteric lymphangiestasia
most common cause of PLE
clinical abnormalities seen w PLE & lymphangiectasia
hypoproteinemia, hypocholesterolemia, lymphopenia, hypocalcemia
Peripheral edema, ascites, hydrothorax
Serosal/mural lesions: Accumulations of granulomatous inflammation forming white masses
lesions in lymphangitis as it responds to fat and chyle
Intestinal lipogranulomatous lymphangitis
Inflammatory foreign body rxn to lipid-rich chyle
No PLE at presentation
causes of chylothorax
idiopathic
trauma
congestive heart failure
chest tumors
viruses that can injure lymphoid tissue
parvovirus
canine distemper virus
feline immunodeficiency virus
equine herpes virus-1
bovine viral disease virus
spread of plague
eating infected animals or bite by an infected flea
gross findings in cats w plague
fever, loss of app, lethargy, enlarged LNs
causes of bacterial lymphadenitis in horses
Streptococcus equi ssp. Equi (Strangles)
Rhodococcus Equi
Johne’s Dz
caused by Mycobacterium avium paratuberculosis
Bovine Tuberculosis
Mycobacterium bovis
Caseous lymphadenitis
caused by Corynebacterium pseudotuberculosis
gross findings in Johne’s dz
Chronic wasting, proliferative enteritis
Enteritis and granulomatous lymphadenitis
gross findings in Bovine Tuberculosis
LNs are necrotic and suppurative/ abscessed
gross findings in caseous lymphadenitis
Purulent to inspissated w concentric laminations
Can cause internal abscessation and chronic wasting