Otic Pathology (Final Exam)

Question 1

The auricle and the external acoustic meatus make up

the

Answer 1

External ear

Question 2

The ossicles, tympanic cavity, and bulla

can be found in the _____ ear

Answer 2

Middle ear

Question 3

The cochlea and semicircular canals comprise the

_______ ear

Answer 3

Inner ear

Question 4

Otitis Externa is very common and usually

due to bacterial/fungal infections caused by:

(Name 4)

Answer 4

• Staph*
• Pseudomonas*
• Proteus*
• Malassezia pachydermatis*

Question 5

Otitis Media is almost always caused by

these 2 bacteria

Answer 5

• Pasteurella multocida*
• Mycoplasms* spp.

Question 6

Inflammation of the Otitis Interna is also known as

Answer 6

Labyrinthitis

Question 7

Hyperkeratotic plaques of the concave external ear of horses

are also known as Aural Plaques, and are usually

caused by this virus, which is spread by flies

Answer 7

Papilloma virus

Question 8

This condition (dogs, pigs) is usually caused by

trauma from excessive head shaking

(centrifugal shearing forces–>fracture cartilage, lacerate vessels)

Answer 8

Auricular Hematoma

Question 9

Ceruminous Neoplasia is the most common neoplasia

of the external acoustic meatus of cats and dogs.

______ are more common in cats

and

_______ are more common in dogs

Answer 9

Carcinomas (cats)

Adenomas (dogs)

Question 10

Inflammatory polyps are non-neoplastic

polyploid masses of the middle ear.

They are far more common in young _____ than in ______

Answer 10

Young cats >>>>> dogs

Question 11

Inflammatory polyps are non-neoplastic

polyploid masses of the middle ear.

What is the pathogenesis of these in dogs?

Answer 11

Chronic inflammation

Question 12

Inflammatory polyps are non-neoplastic

polyploid masses of the middle ear.

What is the pathogenesis of this in cats?

Answer 12

Congenital defect!