Final Flashcards
What is the pathogenesis of pituitary cysts and pituitary dwarfism?
failure of oropharyngeal ectoderm of rathkes pouch to differentiate into cells of pars distalis, resulting in cysts and absence of adenohypophysis
What neoplasm causes compression and atrophy of adjacent portion of pituatary gland and can lead to lack of pituitary trophic hormones?
inactive chromophobe adenomas
What pituatary gland neoplasm destroys the pars distalis and neurohypophyseal system leading to panhypopituitarism and diabetes insipidus?
pituitary gland carcinoma
What are the 3 non-functional pituitary gland neoplasms?
inactive chromophone adenoma
pituitary gland carcinoma
craniopharyngioma
What functional pituitary neoplasm leads to hirsuitism in horses?
pars intermedia adenoma
What are the sequalae of a adrenocorticotroph hormone secreting ademona?
Secretes ACTH –>cushings dz
bilateral enlargement of adrenal glands (cortical hyperplasia)
What form of diabetes insipidus is due to inadequate ADH production due to compression of the pars nervosa, infundibular stalk, or supraoptic nucleus in the hypothalamus?
hypophyseal form
What form of diabetes insipidus is when the target cells in kedneys lack pathway to respond to ADH?
nephrogenic form
What are the 3 layers of adrenal gland cortex and what do they secrete?
Glomerulosa - aldosterone
Fasciculata - cortisol
Reticularis - progesterone, estrogens, androgens
What are immediate and later sequalae of reduced mineralcorticoids in addisons disease?
severe hyperkalemia, pronounced bradycardia
later –>hyponatremia and hypochloremia
What are the consequences of decreased glucocorticoids in addisons disease?
moderate hypoglycemia
hyperpigmentation of skin (lack of negative feedback to pituatary gland and increased ACTH)
What are the consequences of decreased glucocorticoids in addisons disease?
moderate hypoglycemia
hyperpigmentation of skin (lack of negative feedback to pituatary gland and increased ACTH)
What are the 3 causes of addisons disease?
adrenalitis (most common)
adrenocortical hemorrhage (waterhouse-friderichsen syndrome)
idiopathyic adrenocortical atrophy
What are causes of cushings disease?
functional corticotroph adenoma
functional adrenal gland neoplasm
iatrogenic
What are the 4 types of hyperplasia and neoplasia of the adrenal cortex?
Diffuse cortical hyperplasia (ACTH pituatary adenoma)
nodular hyperplasia (1ry)
adenomas of adrenal cortex
adrenal cortical carcinoma
Where do adrenal cortical carcinomas metastasize to?
liver
What is the sequalae of functional carcinomas and adenomas in the adrenal cortex?
severe atrophy of the contralateral adrenal cortex (negative feedback)
Where can pheochromocytomas invade? metastasize?
caudal vena cava
metastasize to liver, LN and lungs
What cells produce calcitonin?
Thyroid C cells (parafollicular)
What is the role of calcitonin?
antagonistic with PTH on bone resorption BUT synergistic in decreasing renal tubular reasborption of phosphorus
What are the 3 ways PTH respond to low calcium levels?
increasing osteoclasts
decreased reabsorption of P and increased Ca in kidneys
increase absorption of Ca and P in intestinces
What are the 3 causes of hypothyroidism?
lymphocytic thyroiditis
bilateral nonfunctional follicular cell neoplasm (and goiter)
long standing pituitary gland or hypothalamic lesions
What happenes to the skin in hypothyroidism?
hyperpigmentation, myxoedema, alopecia, hyperkeratosis
What happenes to the skin in hypothyroidism?
hyperpigmentation, myxoedema, alopecia, hyperkeratosis
What is the cause of colloid goiter?
tooo much iodide added to diet, interferes with thyroid hromone synthesis and secretion
What species most commonly gets Thyroid C (Ultimobranchial) cell neoplasma?
bulls
What is the most common primary hyperparthyroidism neoplasm?
Functional chief cell neoplasms
What causes big head disease in horses?
secondary nutritional hyperparathyroidism
What 3 neoplasms can cause pseudohyperparathyroidism?
apocrine gland adenocarcinomas (anal sac)
neoplasms metastatic to bone
lymphoma
What are the 3 main cells of pancreatic islets and what do they secrete?
alpha cells - glucagon
beta - insulin
delta - somatostatin
What are 4 causes of type 1 diabetes in dogs?
idiopathic atrophy of pancreas
acute pancreatitis
chronc pancreatitis
immune mediated isletitis
What are 2 causes of type 2 diabetes in cats?
hydropic degeneration with glycogen accumulation
deposition of amyloid
What are 2 causes of type 2 diabetes in cats?
hydropic degeneration with glycogen accumulation
deposition of amyloid
What is the sequalae of insulinomas?
neurologic disease, neuron necrosis (hypoglycemia)
What cells are affected in a centrilobular pattern of injury to the liver? What causes it?
least oxygenated hepatocytes around central vein –>due to hypoxia
What liver injury pattern is very similar to centrilobular and caused by the same things?
paracentral pattern (more “global”)
What pattern of liver injury is steroid hepatopathy in dogs?
steroid hepatopathy in dogs
What liver injury pattern results from “direct acting” toxicant?
periportal pattern
What does a bridging liver injury pattern suggest?
severe and extensive damage
Term for a flat discoloration on the skin.
Macule
Term for nodular elevation in skin.
papule
Term for a flat, solid, elevated lesion similar to a papule but larger.
Plaque
A callus is what type of skin lesion?
plaque
Term for a raised lesion with central pallor.
wheal
Which species get macronodular cirrhosis?
cats, dogs, humans
Term for when hepatocytes focally drop out and sinusoids dilate to produce irregular red spaces. Which species?
telangiectasia
species - cows and older cats
What kind of portal vena caval shunts are more common in larege breed dogs?
intrahepatic
What do livers look like in congenital portal caval shunts?
duplicated arterioles, small lobules
What is a cause of bacillary hemoglobinuria in the liver?
clostridium haemolyticum (combo with flukes in cattle and sheep)
What causes tyzzers disease?
clostridium piliforme
What are the species that can cause milk spot scarring in the live?
nematodes pigs - ascaris horses - strongylus dogs - stephanarus dogs and cats - capillaria hepatica
What animals most commonly get “hepatosis dietetica” (vit a/selenium deficiency)?
growing baby pigs
What are the 3 types of toxins that cause centrilobular to massive necrosis?
blue green algae
phalloidin (mushroom)
inorganic iron (baby pigs)
What 2 liver toxins can cause chronic hepatitis and lead to end stage liver?
pyrrolizidine alkaloids - megalocytosis
aflatoxin - megalocytosis and lipidosis
Which species most commonly get nodular hyperplasia of the liver?
dogs
What species get hepatocellular adenoma?
young ruminants
What species commonly gets cholangiolar carcinoma?
cat
Term for gallbladder filling with mucus to the point it may rupture. Common in small dogs.
mucocoele
What is seen grossly with acute pancreatitis?
necrosis predominates over suppurative inflammation.
prominent interstitial edema
hemorrhage, saponified hat
What are the 3 general mechanisms for acute pancreatitis?
biliary reflux
direct damage to acinar cells
overstimulation of acinar cell
Vet term for cleft palate.
palatoschisis
What is cheiloschisis?
hare lip
What are the “big four” vesicular viruses?
Foot and mouth
vesicular stomatitis
vesicular exanthema of swine
swine vesicular dz
What viruses can cause full thickness necrosis of the oral epithelium causing erosion?
BVDV, malignant catarrhal fever, bluetongue
calicivirus - cats
rhinotracheitis in horses
What 3 etiologies cause necrotizing stomatidies?
calf diphtheria in calves (fuso necrophorum)
NOMA in primates and dogs (stomatitis)
gingivitis in young dogs and old cats
Looks like gingival hyperplasia but is actually remnant of tooth germ epithelium.
epulis
What should you think of if tonsils are bilaterally enlarged?
infection or lymphoma
What if only one tonsil is enlarged?
infectious or SCC
Disorder where there is a esophageal propulsive disorder.
achalasia
Another term for megaesophagus.
ectasia
What are the four distinct sites for choke?
dorsal to the larynx
throacic inlet
base of the heart
diaphragmatic hiatus
What causes primary bloat (frothy)?
sudden change in diet, to one rich in legumes
What causes secondary tympany?
inibility to eructate
What are the causes of neurogenic secondary tympany?
vagal damage
What are the 3 causes of obstructive secondary tympany?
lymphosarcoma in wall of rumen
choke
viral papillomas
What pH indicates the rumen is infected?
low pH (build up of lactic acid)
Where do gastric ulcers occur in pigs?
non-glandular portion
What can cause hemorrhagic abomasitis in young sheep and cattle from a heavy bout of nursing?
clostridium septicum
What parasite grows along the margo plicatus?
gasterophilus spp
What nematode causes anemia in sheep?
Haemonchus contortus
What nematodes live in gastric glands of cattle?
ostertagia spp.
What can cause hyperplasia of the gastric mucosa in dogs?
gastrinomas of the pancreas
What dog breeds get giant hypertrophic gastropathy?
basenji, beagles, boxers and bull terriers
Why are adenocarcinomas of the stomach so deadly in dogs?
highly invasive, mared scirrhous response, clinically late
What is a GISTs? (gastrointestinal stromal tumor)
any mesenchymal tumor of the stomach, most often leimyoma
What is the most common gastric neoplasm?
lymphosarcoma
What type of diarrhea is the volume of feces is generally quite profuse and very watery?
small intestinal diarrhea
What diarrhea is when the volume of feces is small and more thicker with bits of solid material?
colonic diarrhea
What frequency is seen with small intestinal diarrhea? colonic diarrhea?
small - only mildly increased
colonic - very much increased
What toxicities cause functional obstructions?
cattle - lead
zinc - dogs, cats, horses
What can cause an anal stricture in pigs?
salmonellosis damages hemorrhoidal artery
What is volvulus?
twisting of intestine around mesenteric attachment
Red to blac fibrovascular plaques along ileum of horses
hemomelasma ilei
Red stripes that correlate with congestion of mucosal ridges in the colon
tiger striping