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OSCEs > export_final exam anat path cattle cases > Flashcards

export_final exam anat path cattle cases Flashcards

1
Q

multifocal hemorrhage of grey and white cerbral cortex and thalamus in cattle- cause and clinically

A

ITME- H somni clinically: calves sudden death, ataxia, recumbancy, blindness, fever

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2
Q

fibrinous pericarditits and hemorrhagic MYOcarditits cause in cattle (not endocarditis or pericarditis)

A

Blackleg- Clostrid chauvei

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3
Q

how confirm diagnosis of ITME

A

bacterial culture

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4
Q

other causes of brain dz in feedlot calves;

A

Polio (sulfur tox or grain overload) Lead tox Rabies Less common: Listeria, nervous coccidiosis, hypo vit A

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5
Q

Is a bloat line pathognomonic for bloat?

A

no- bacteria after daeth can produce gas that can create such a line

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6
Q

Other lesions that point to ruminal bloat

A

congestion of facial soft tissue, esp nasal turbinates +/- inguinal edema from lymphatic blockage

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7
Q

pathogenesis of C. Chauvei:

A

spores in envir ingested and latent in mm- bacteria becomes active when muscle is damaged or hypoxic -bacteria releases endotoxin and increases vasculature permiability leading to fibrinous pericarditis and myocardial hemorrhage

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8
Q
  • how confirm dx of C. Chauvei
A

FA on frozen section- culture is too difficult

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9
Q

Vesicular dz of cattle:

A

Vesicular stomatitis FMD Dx: call CFIA!

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10
Q

other causes of erosion on tongue other than vesicular dz of cattle:

A

-caustic agents -BVD -papular stomatitis

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11
Q

white worm in caudal trachea that causes atelectasis of cranial lungs= and where cattle get it?

A

Dictyocaulus vivi Cattle get it from eating pasture

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12
Q

which lung worm do we see the most in ON with sheep?

A

Muellaria (not Dictyocaulus)

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13
Q

suppurative necrotising myocarditis- think:

A

H somni

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14
Q

H. somni causes:

A

ITME septicemia: pleuritis, pericarditis, polyarthritis bronchopneumonia: just like Manheimia

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15
Q

causes of polyarthritis in feedlot cattle

A

Mycoplasma bovis H. somni (less obvious)

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16
Q

etiology(s)

A

Manheimia

Histophilus somni (look same)

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17
Q

how age lung lesions?

pleural adhesions vs abcessation

A

pleural adhesions- 7-10d

abscesses: at least 2wks

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18
Q

does absence of pleural adhesions or abscess mean lesion is acute

A

no, not nec

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19
Q

lesion: cranioventral lung is rubbery, atelectatic, and congested; but is not as hard as would be expected in bacterial bronchopneumonia. etio:

A

BRSV(*)

PIV3, Corona maybe

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20
Q

confirm BRSV via

A

IHC- brown staining Ag in bronchiolar epithelium

VI not good b/c too hard to grow

21
Q

http://classconnection.s3.amazonaws.com/122/flashcards/2930122/jpg/1-145466865F10368597D.jpg

A

BRSV with IHC

22
Q

what gross findings= rumenal acidosis or grain overload (3)

A
  1. fixation of rumenal mucosa to wall
  2. acidic rumen content (soon after death)
  3. histo: clustering neuts within ruminal mucosa
23
Q

http://classconnection.s3.amazonaws.com/122/flashcards/2930122/jpg/1-145466B46E801CED439.jpg

A

endocardial hem in ruminants is incidental! neither is epicarial “agonal” hemorrhages

24
Q

etiology

A

MAP= Johnes

25
Q

how confirm MAP?

A

histo- ileum and LN

mycobact culture but takes 4-6months to grow

26
Q

what want to RO with MAP testing

A

Salmonella

27
Q

cranioventral 60% of the lung is consolidated, reddened, and contains numerous white nodules. On cut section, these nodules are white, circular, coalescing, bulging, and palpation reveals that they are friable and crumbly- etio

A

MycoPLASMA bovis

vs. one large lesion in Mycobactium bovis= tb

28
Q

if need to confirm Mycoplasma bovis (if PM lesions not characteristic enough)

A

IHC and histo

29
Q

culture good for dx Mycoplasma bovis?

A

no- can be cultured from N lungs

30
Q

pathogen of Mycoplasma bovis

A

-opportunitistic bact grows after Manheimia makes unhealthy tissue- attacks lung after antibiotics kill manheimia= chronic infection

31
Q

best strategy to prevent Mycoplasma bovis:

A

prevent shipping fever pneumonia and early detection since no specific control measures and it’s resistant to antibiotics= chronic infection

32
Q

http://classconnection.s3.amazonaws.com/122/flashcards/2930122/jpg/1-1454673438049878A04.jpg

A

white mm disease

33
Q

other dz’s that can cause myocardial necrosis like WMD

A
  • monensin, lasalocid

- doxy, cottonseed meal, toxic plants less commonly

34
Q

should test for vit E and Se levels in tissue wehn dxing WMD?

A

not worth while- just confirm with histo

35
Q

how prevent WMD

A

supplement Vit E and Se

36
Q

cortex fluoresces under UV- ddx

A

Polio

-identical lesions can be caused by thiammine deficiency, sulfur tox, lead toxicity

37
Q

animals with polio respond to____

A

thiamine tx if treated early

38
Q

when does thiamine deficiency occur (is it nutritional?)

A

not nutritional- more secondary to grain overload and abN ruminal bacteria

39
Q

if a lot of animals have blindness, head pressing, opisthotonas- tell prod what

A

giving too high energy rations = thiamine deficiency

40
Q

IBR (BHV-1) kill calfs with rhinotrach?

A

no- but impairs muco-cil clearance so die from 2nd bact invaders

41
Q

where sample tissue for confirmation of IBR

A

trach or nasal epith- not lungs “harvest tissue that have lesions”

42
Q

http://classconnection.s3.amazonaws.com/122/flashcards/2930122/jpg/1-14547217A2E633C9879.jpg

A

amnion with plaques (focal squamous metaplsia of no significance)

43
Q

how know it’s the amnion?

A

no cotyledons

44
Q

kidney and those below show the opened abomasum and duodenum, with lesions in the perirenal fat and in the omental fat. The lesions are hard but crumbly - etio:

A

abdominal fat necrosis- incidental finding

45
Q

abomasal ulcer in suckling calf dt

A

unknown- not stress

46
Q

duodenum in normal position should run ____and ____ from abomasum

A

dorsal and caudal (not cranioventral)

47
Q

http://classconnection.s3.amazonaws.com/122/flashcards/2930122/jpg/1-145472BCEEA4938EE1A.jpg

A

adventitial placental with TNCT tiny caruncles and cotyledons with four normal sized ones

48
Q

adventitial placental means what?

A

placental insufficiency- no specific etio

49
Q

bone marrow gelatinous can signify

A

negative E balance (eg. MAP)

OSCEs (10 decks)

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