Differentiate otitis media from otitis externa in terms of location of the infection.

Differentiate otitis media from otitis externa in terms of location of the infection.

• A. Otitis media is in the middle ear; Otitis externa is in the external auditory canal.
• B. Otitis media is in the external auditory canal; Otitis externa is in the middle ear.
• C. Otitis media is in the inner ear; Otitis externa is in the middle ear.
• D. Otitis media is in the middle ear; Otitis externa is in the inner ear.

Answer: (A)

Infections are categorized by where they occur within the ear: otitis media involves the middle ear, the air-filled space behind the tympanic membrane, while otitis externa affects the external auditory canal, the passageway from the outer ear to the eardrum. This distinction matters because it guides what you’d see on examination and how you treat them. In otitis media, the tympanic membrane is often red and bulging with reduced mobility due to fluid behind it. In otitis externa, the ear canal is inflamed, swollen, and sometimes discharge is present, with the tympanic membrane typically not involved. Therefore, identifying the site as the middle ear versus the external auditory canal best differentiates the two conditions.

Infections are categorized by where they occur within the ear: otitis media involves the middle ear, the air-filled space behind the tympanic membrane, while otitis externa affects the external auditory canal, the passageway from the outer ear to the eardrum. This distinction matters because it guides what you’d see on examination and how you treat them. In otitis media, the tympanic membrane is often red and bulging with reduced mobility due to fluid behind it. In otitis externa, the ear canal is inflamed, swollen, and sometimes discharge is present, with the tympanic membrane typically not involved. Therefore, identifying the site as the middle ear versus the external auditory canal best differentiates the two conditions.