Feline Otitis Externa and Media Study Guide
Overview and Clinical Importance
Otitis externa is inflammation of the external ear canal, while otitis media involves the middle ear (tympanic bulla and cavity). In cats, otitis accounts for approximately 5% of feline veterinary visits compared to 15% in dogs. Despite this lower prevalence, feline otitis presents unique diagnostic and therapeutic challenges that are frequently tested on the NAVLE.
The most common cause of feline otitis externa is Otodectes cynotis (ear mites), responsible for 50-85% of cases. Unlike dogs, feline otitis media more commonly results from ascending infections via the Eustachian tube (from upper respiratory infections) rather than descending from otitis externa.
Feline Ear Anatomy: Key Differences from Dogs
Understanding feline ear anatomy is essential for proper diagnosis and treatment. Key anatomical features include:
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