Hemolymphatics Flashcards
What cells do combined immunodeficiency disorders (CIDS) affect? TQ
Both Humoral (B cells)and Cell mediated immunity (T cells)
What breed does equine CID affect, eitology & sequele?
ArabiansInheritedFailure of function of B and T lymphocyte production
Who gets XSCID? What is the sequele?
Dogs- bassets & welsh corgisMales lack mature functional T lymphocites, low IgG & IgA w/ normal IgM
What do degenerative Thymus disorders result in?
Variable degrees of aquired immunodefeciency
What are the degenerative disorders of the Thymus?
AtrophyLoss of ArchitectureLymphocyto-lysisReduced lymphocyte populations
What neoplastic disease of the Thymus affects young animals?
Thymic Lymphoma (T-lymphocyte neoplasm)
What is thymoma?
Thymic epithelial cell neoplasm w/ mix of non-neoplastic lymphocytes.
Are thymoma’s benign or malignant, what age animal do they occur in?
Usually BenignSeen in older animals
What other dz’s are associated with thymomas? (TQ)
Myasthenia gravis +/- megaesophagusImmune mediated polymyositis
What causes thymic hemorrahage and hematomas,? What species?Sequele?
Trauma, ruptured aortic aneurisms, Rodenticide poisoningDogsSudden hypovolemic shock
What are the two types of physical injury could happen to the spleen? TQ
Rupture-HBC, neoplasm rupture (hemangio(sarco)ma/lymphosarcoma), SplenomegalyTorsion- strangulation of pole pigs, GDV dogs
What are the three types of splenic degeneration and necrosis?
SiderofibrosisAmyloidosisHemosiderosis
What is siderfibrosis, the lesions and who gets it?
Sidero-calcific plaques of capsule “gamna-Gandy bodiesFibrosis of capsule, hemosiderosis, granular encrustationsAged dogs
What is amyloidosis & lesions?
“Sago Spleen”Prominent white pulp
What is hemosiderosis?
Pigmentation from hemosiderin (storage form of iron)
Eitology of hemosiderosis?
Breakdown of RBC’sDecrease erythropoiesis = less iron demandhemolytic anemiachronic heart failureIron dextran injection pigsHemorrhage (trauma)Hematomas,infarcts
What type of atrophy of the spleen is frequent in old dogs?
Nodular Hyperplasia
When does extramedulary hematopoiesis happen in the spleen?
Young animals = normalcompensatory in anemia
What can lead to uniform splenomegally with a bloody consistency “bloody spleen”?
Congestion- torsion, barbituate, euthanasia, sedationAcute hyperemia- septicimia, inflammationAcute hemolytic anemia- babesiosis, EIA
What can lead to uniform splenomegaly with a firm consistency “meaty spleen”? TQ
Chronic hemolytic anemia (EIA)Extramedullary hematopoiesis (EMH)Chronic infectious DzLympohid hyperplasiaBacteremia & low septicemiaNeoplasia (primary)Splenic myeloid mataplasia, histocytosis
What can lead to nodular spenomegaly with bloody nodules?
Hematoma from lymphoid hyperplastic nodules or splenic vascular neoplasmsIncomplete contractionAcute infarcts (wedge shaped)
What can lead to nodular splenomegaly with firm nodules?
Nodular hyperplasia- lymphoidPrimary neoplasmsMetastatic neoplasmsAbscesses- acute infectious dzGranulomas- chronic infectious dz
What are the main causes of small spleens?
Developmental anomaliesAging changesWasting &/or cachectic DzSplenic contraction
What is damaged in wasting &/or Cachectic Dz of spleen? TQ
Atropy of T-lymphocyte areasLittle-no effect on B lymphocytes
What are the Neoplastic Dz of the spleen?
LymphomaHemangiomaHemangiosarcomaMetastatic Neoplasms
What are the 3 ways lymph nodes response to injury?
Hyperplastic changesAtrophic ChangesInflammation
What are the 5 things that can cause small lymphnodes?
Developmental disorders (SCID)Lack of antigenic stimulationCachexia & malnutritionAgingViral
What is the sequele of Cachexia & malnutrition on lymphnodes? TQ
Smaller than normal LNAtrophy of T areas –> decrease in T lymphocytes with little to no effect on B-lymphocytes
What are the agents and sequele of Viral infections on lymphnodes? TQ
Lymphocytolysis (BVDV, CDV)Stimulate Lymphiod Tissue (Maedi-Visna, MCFV)Neoplasia (FLV, BLV, Marek’s)Atrophy (FIV)
What are the 3 causes of enlarged lymphnodes?
Lymphoid HyperplasiaLymphadenitisNeoplasa
What are the 2 types of lymphoid hyperplasia? TQ
Follicular (B-lymphocytes)Diffuse (T-lymphocytes)
What are the two types of Lymphadenitis?
AcuteChronic
What are the two types of Chronic Lymphadenitis?
Chronic Suppurative (active)Chronic Granulomatous
What are the 2 types of Chronic Granulomatous and their etiological agents?
Focal granulomatous - tuberculosis (pearls dz), Crptococcus, ActinobacillusDiffuse Granulomatous- Histoplasmosis, Leishmaniasis, Johne’s dz (non caseating) “M paratuberculoisis”
What is the most common primary neoplasm of LN?
Lymphocarcomamalignant cells cause loss of architecture in cortex & medulla
What are two substances observed in LN?
Chyle (post prandial)Gas emphysema
What growth disturbance of the LN is an important cause of lymphadenopathy?
Hyperplasia
What are the 4 types of hyperplasia of the LN?
Follicular & diffuse lyphoid hyperplasiaAcute lymphadenitisChronic lymphadenitisNeoplasia (primary & metastatic)
What is the difference microscopically between LN Neoplasia of the LN & Lymphoma? TQ
Neoplasia - Lack of capsular invasion & preservastion of architectureLymphoma- Capsular invasion & loss of architecture
What are the two types of lymphoma in cattle? TQ
Enzootic Bovine Leukosis (BLV)Sporadic Bovine Leukosis
Enzootic Bovine Leukosis affects cattle of what age? TQ
Adults 4-8 years
What virus is responsible for Enzootic Bovine Leukosis? TQ
Bovine Leukemia Virus (BLV) a retrovirus
What locations in cattle will you find the lesions of Enzootic Bovine Leukosis? TQ
“HAULS”HeartAbomasumUterusLNSpinal Canal
Sporadic Bovine Leukosis affects cattle of what age group? TQ
Young animals
Is Sporadic Bovine Leukosis associated with BLV?
No
What is the age group & distribution of calf/juvenile type of Sporadic Bovine Leukosis?
Calves up to 6 months oldMulticentric
What is the age group of calves affected with Thymic type Sporadic Bovine Leukosis?
1-2 year olds
What is the age group and lesion of cutaneous sporadic bovine leukosis?
2-3 year old cattleskin nodules
What is the presentation of horses with lymphoma?
VariableMulticentricAlimentaryCutaneousSplenicAbdominal
What is the most common presentation of lymphoma in dogs? TQ
Multicentric LN, Liver Spleen bone marrowUnusual presentation b/c Normal architecture is present but cortex/medulla is obliterated
What causes lymphoma in cats & how does it present?
FeLVMulticentricAlimentaryThymicMiscellanous
Bone Marrow Response to injury?
AbnormalProliferationConcentrationStructure or function
What is aplastic anemia? TQ
A type of abnormal proliferation leading to the absence of a particular hemopoietic lineage
What is the absence of all hemopoietic lineages?
Aplastic pancytopenia
What can cause aplastic anemia?
Chemicals Infections
What chemicals cause aplastic anemia?
Phenylbutazone (horse, dog)Bracken Fern (cattle, sheep)Estrogen (dogs)
What type of infections casue aplastic anemia?
Non-regenerative AnemiaEhrlichiosis–> BM hypoplasiaFeLV–> affects precurser cellsEIA–>cyclic infectionCytauxzoon felis–>excellerated RBC destruction/removalOtherParvoFIV–> anemia from concurrent dz
Whate is neoplasia of bone marrow called and where does it occur?
LeukemiaFrom bone marrow hematopoietic cells
How is Leukemia classified?
Cell of origion Lymphocytic (outside BM)Myelogenous (non-lymphoid origon)Degree of differentiationAcute- poorlyChronic- well
What is Myelophthisis? TQ
Replacement of hematopoietic tissue in BM by fibrous tissue, malignant cells or granulomas