Cytology Flashcards

1
Q

Utility of cytology

A

Non-invasive
No anesthesia
Fast results
Cost effective
Fast treatment

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2
Q

Limitations of cytology

A

Small sample area: actual cause of lesion may be missed
Nondiagnostic samples occur: poorly exfoliating lesions,
acellular samples
ruptured cells
blood contamination
improper slide prep/staining

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3
Q

What kind of sampling do you do on a solid mass?

A

Aspiration
Fenestration
Impression smear

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4
Q

What kind of sampling do you do on a fluid filled mass?

A

Aspiration

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5
Q

Sample collection protocols

A

Multiple areas should be sampled
Aspirate edges of large lesions to avoid necrotic centers
DO NOT heat fix or expose to formalin

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6
Q

Common cytological artifacts

A

Lube/alcohol
Glove powder
Pollen
Finger prints/anucleated squamous epithelial cells

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7
Q

Aspiration of epidermal inclusion cyst will yield?

A

Cheesy material
Kertinized epithelium
Cholesterol crystals
+/- inflammation

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8
Q

Aspiration of an aprocrine cyst will yield what?

A

Clear fluid
low cellularity

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9
Q

Aspiration of a sebaceous cyst will yield what?

A

Brown/oily fluid
low cellularity
Basophilic proteinaceous background

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10
Q

Aspiration of hematoma and seromas

A

Fluid filled
May need to be concentrated by centrifugation
Hematomas: hemodilute, low numbers MQ, no platelet
Seromas: low #s erythrocytes, occ. reactive MQ, no platelets, +/_ neutrophils

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11
Q

Causes of lymphocytic inflammation

A

Antigenic stimulation: insect bites, vaccines, virus
Type IV hypersensitivity

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12
Q

Causes of neutrophilic inflammation

A

Chronic inflammatory processes
Will be supperative, purulent
Degenerate: karyolytic, bacterial or fungal infection
Non-degenerate: sterile inflammatory process (immune mediated, caustic injury, trauma)

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13
Q

Causes of eosinophilic inflammation

A

Parasitic infestations
Allergy/Type I hypersens.
Immune mediated diseases
Paraneoplastic onditions (mast cell tumors, carcinomas)

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14
Q

Causes of histiocytic inflammation

A

Reactive MQs predominate/multinucleated giant cells
Foreign body reaction (hair shaft/stick)
Fungal infection
Atypical bacterial infection
Chronic irritation

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15
Q

What kind of inflammation do you expect to see with pyogranulomatous inflammation?

A

Neutrophilic and histiocytic inflammation

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16
Q

Causes of mixed inflammation?

A

Lick granulomas
Vax reaction
Persistent infections
Foreign body reactions

17
Q

What type of cells are spindle-shaped?

A

Mesenchymal cells

18
Q

What does anisocytosis mean?

A

Different sized cells (characteristic of malignancy)

19
Q

What does anisokaryosis mean?

A

Different sized nuclei
(characteristic of malignancy)

20
Q

Epithelial cell appearance

A

Large cells
High cellularity
Sheets with cell junctions
Distinct cytoplasmic borders
round to polygonal nuclei

21
Q

Common benign epithelial neoplasms

A

Papilloma
Adenoma
Basal cell tumors

22
Q

Follicular tumors

A

Basal epithelial cells
Common on head and neck
Benign: cats, horses, dogs
Malignant: common in cats, rare in dogs

23
Q

Common malignant epithelial neoplasms

A

Adenocarcinoma
Squamous cell carcinoma
Transitional cell carcinoma
Anal sac adenocarcinoma (hypercalcemia)

24
Q

Benign mesenchymal tumors

A

Lipomas
Fibromas
Neurofibromas
Myxomas
Nerve-sheath tumors
Perivascular wall tumors
Sarcoids (horses)

25
Q

What is the criteria for a mesenchymal tumor to be malignant?

A

Must have at least 5 characteristics of malignancy
but rarely metastasize

26
Q

Round cell tumors

A

Mast cell tumor
Plasma cell tumor
Histiocytoma
Transmissible Venereal tumor
Lymphoma
Melanoma

27
Q

What is transudation?

A

Low oncotic pressure due to hypoalbuminemia
High hydrostatic pressure
Low cellularity and low protein

28
Q

What is exudation?

A

Inflammatory-increased vascular permeability due to inflammation
Cellular and proteinaceous: neutrophils, MQs, fibrin, globulins

29
Q

Transudate pathogenesis

A

Severe right atrial and ventricular dilation
Tricuspid valve dysplasia
Severe tricuspid valve insufficiency

30
Q

Uroabdomen pathogenesis

A

Low protein, low cell count at first but will increase if chronic
Creatinine higher than serum levels
Biochem: azotemia, hyperkalemia

31
Q

Chylous effusion pathogenesis

A

Rupture of thoracic duct
triglyceride rich fluid from lacteals
Secondary to trauma, tumor, idiopathic

32
Q

Hemorrhagic effusion pathogenesis

A

Rupture of spleen or liver, heart based tumor: hematoma or hemangiosarcoma
PCV close to that of peripheral blood
Hemosiderin containing MQs

33
Q

Cytology of normal/hyperplastic lymph nodes

A

75-95% small, well-differentiated lymphocytes

34
Q

Cytology of reactive lymphoid tissue

A

mostly small, well-differentiated lymphocytes
Increased numbers of intermediate and large lymphocytes
Some more plasma cells, some Mott cells, some neutrophils and macrophages

35
Q
A