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19 Cards in this Set

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T or F:
Most aural hematomas are self-inflicted.
True!
What structures form the external ear canal?
Auricular and scutiform cartilages
What scrub solution should be used when cleaning the ear pinna for surgery?
Betadine (chlorhex is toxic to the cornea)
When suturing an aural hematoma, how should your sutures be oriented and why?
Vertical; prevents vascular occlusion
Where is aural neoplasia most common?
Central convex surface
What is the most common bacteria causing otitis externa? Yeast?
Staph. intermedius;
Malassezia
What are treatment options for end stage otitis externa?
Really only one - TECA (total ear canal ablation)
T or F:
TECA is always combined with a LBO.
True!
TECA (total ear canal ablation)
LBO (lateral bulla osteotomy)
When performing a LBO, what structures must be avoided? What tissue must be definitively removed?
Avoid facial n., vestibulochoclear apparatus, retroarticular vein
Make sure to remove epithelial lining of the bulla
What are the most common malignancies of the ear?
Ceruminous gland adenocarcinoma
SCC
Carcinomas of undetermined origin
What are the most common benign tumors of the ear?
Inflammatory polyps
papillomas
ceruminous gland adenomas
basal cell tumors
How does cat and dog middle ear anatomy differ?
Middle ear of cat separated into 2 chambers by a bony shelf; also more cilia and secretory cells than dogs
In dogs with otitis media, bacteria usually enters via the ____________________ while in cats it enters via the __________________.
Dogs (external acoustic meatus)
Cats (nasopharynx and eustacean tubes)
What is the tissue origin of middle ear polyps and how is it treated? Which species does this occur in?
Typmanic epithelium of cats; treated with traction (pull the sucka out)
What are indications for a ventral bulla osteotomy?
middle ear disease without external ear involvement
T or F:
Horner's syndrome is a common sequel to a lateral bulla osteotomy.
False!
Horner's is a sequal to a VENTRAL bulla osteotomy
What are the signs of Horner's syndrome?
Enopthalmos
Ptosis (droopy eye)
Miosis (pupillary constriction)
T or F:
Neoplasia in the middle ear is nearly always an extension of external ear canal tumors.
True!
What happens when ear canal epithelium gets trapped within the middle ear?
Aural cholesteatoma