YR3 20 SSEar

Question 1

Ear - Major Regions

Answer 1

External, Middle & Inner

Question 2

Ear - External

Answer 2

Auricle & external acoustic meatus

Question 3

Ear - Middle

Answer 3

Ossicles, tympanic cavity & bulla

Question 4

Ear - Inner

Answer 4

Cochlea & semi-circular canals

Question 5

Ear - Disorders that affect convex surface of the auricle; list

Answer 5

1) Alopecia
2) Aural plaques
3) Canine leproid granuloma

Question 6

Auricle - Pinnal Alopecia; lesion, species

Answer 6

Bilaterally symmetric lesions most severely affecting the convex surface of the distal half of the auricles. Dog - permanent, Cat - Siamese, spontaneously resolves

Question 7

Aural plaques

Answer 7

Multiple, hypopigmented, exophytic grey-to-white masses grow on the concave surface of auricle. Often, these plaques coalesce to form a large mass.

Question 8

Canine leproid (lepromatous) granulomas

Answer 8

Several pyogranulomas are present in the subcutis of the convex surface of the external ear

Question 9

Ear - Disorders that affect the auricular size and shape; list

Answer 9

1) Microtic & Distorted ears
2) Gotch Ear
3) MPS VI

Question 10

Auricle - Microtic & Distorted Ears; lesion, species, sequelae

Answer 10

Auricle substantially small - Cats & ‘Elf ears’ in goats. Dogs - Impaired hearing

Question 11

Auricle - Gotch Ear; species; agent

Answer 11

Cattle ear deformity due to infection with Gulf coast tick, Ambyomma maculatum

Question 12

Mucopolysaccharidosis (MPS) VI

Answer 12

The auricles in the cat with MPS VI are smaller than the normal cat. The bridge of the nose is also broader in the cat with MPS VI when compared with the normal cat

Question 13

Auricle - Infarction

Answer 13

Due to loss of blood supply e.g. frostbite

Question 14

Auricle - Hematoma

Answer 14

The concave surface had become convex due to expansion of underlying CT by mixtures of blood and eosinophilic fibrin

Question 15

Ear - Inflammatory Diseases; list

Answer 15

1) Ceruminous Exudate
2) Otitis Externa
3) Cutaneous dematophilosis
4) Auricular chondritis
5) Canine leproid granuloma

Question 16

Auricle - Ceruminous Exudate

Answer 16

Bovine, infection with spinose ear tick

Question 17

Auricle - Otitis Externa

Answer 17

Auricle is thickened, reddened and painful with obvious otorrhea

Question 18

Otitis Externa; pathogenesis

Answer 18

Increase in ceruminous glands in the dermis > glands dilated and filled w/ inflammatory cells - neutrophils, macrophages, lymphocytes & plasma cells. Inflammatory cells also present in the periadnexal dermis > lymphoid aggregates form nodules in the dermis near the cartilaginous rings of the external acoustic meatus > the overlying epidermis is mildly to moderately thickened (acanthosis) >luminal diameter has been markedly reduced which can further exacerbate the problem of otitis externa

Question 19

Otorrhoea

Answer 19

Discharge from the ear

Question 20

Auricle - Cutaneous dermatophilosis

Answer 20

The auricular skin, as well as skin of the muzzle, face, and periocular region, is matted from a severely exudative dermatitis caused by Dermatophilus congolensis

Question 21

Auricular chondritis

Answer 21

The auricle is thickened and expanded by a chronic inflammatory exudate containing lymphocytes and fewer numbers of macrophages.

Question 22

Ear - Neoplasm

Answer 22

1) Squamous Cell Carcinoma
2) Melanomas
3) Ceruminous Gland Adenocarcinoma
4) Proliferative, necrotizing otitis externa
5) Nasopharyngeal polyp

Question 23

Auricle - Squamous cell carcinoma

Answer 23

Auricle ulcerated and covered by a serohemorrhagic crust caused by SCC

Question 24

Auricle - Melanomas

Answer 24

Highly malignant and believed to be caused by UV irradiation

Question 25

Proliferative, necrotizing otitis externa

Answer 25

Thick proliferative mass grows from the inner, concave surface of the auricle and extends into the external acoustic meatus

Question 26

Nasopharyngeal polyp

Answer 26

A small, central bulge of hypoechoic tissue extends from the left tympanic cavity into the nasopharynx, presumably through the auditory tube

Question 27

Ear - Congenital Disorders

Answer 27

1) External Acoustic Atresia
2) Microtic & Distorted ears
3) MPS VI

Question 28

External Acoustic Atresia - Congenital, unilateral

Answer 28

Absence or closure of the ear canal

Question 29

Ear - Disease caused by parasites

Answer 29

1) Gotch Ear

2) Ceruminous Exudate