Acute Otitis Media and Otitis Externa are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Acute Otitis Media vs Otitis Externa at a glance
Acute Otitis Media: Acute middle ear infection with effusion and signs of inflammation, most common in young children.
Otitis Externa: Acute inflammation of the external auditory canal, usually bacterial, often associated with water exposure.
Try two board-style questions on Acute Otitis Media vs Otitis Externa
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Question 1EENTEasy
A 4-year-old has 24 hours of right ear pain, fever 39 C, and decreased hearing. Otoscopy shows a bulging, erythematous tympanic membrane with loss of bony landmarks. Which of the following is the most appropriate initial treatment?
AHigh-dose amoxicillin
BCiprofloxacin otic drops
CAzithromycin suspension
DObservation for 48 hours
Reveal answer & full explanation
Correct answer: A — High-dose amoxicillin
AHigh-dose amoxicillin✓
BCiprofloxacin otic drops
CAzithromycin suspension
DObservation for 48 hours
Why High-dose amoxicillin is correct
This child has acute otitis media (AOM): acute onset, middle-ear effusion, and a bulging, erythematous tympanic membrane; a temperature ≥39°C makes it severe AOM by AAP criteria.
For AOM in a child ≥2 years with severe symptoms, high-dose amoxicillin 80–90 mg/kg/day divided BID is first-line therapy.
Systemic (oral) therapy is required because the infection is in the middle ear behind an intact tympanic membrane; topical drops cannot reach it.
The high dose overcomes intermediate penicillin resistance and covers the most common pathogens, Streptococcus pneumoniae and Haemophilus influenzae.
Why the others are wrong
Ciprofloxacin otic drops — right-concept-wrong-setting: topical fluoroquinolone drops treat otitis externa or otorrhea through tympanostomy tubes, not AOM behind an intact membrane.
Azithromycin suspension — reserved for penicillin-allergic patients and is the least preferred alternative due to high S. pneumoniae macrolide resistance; not first-line here.
Observation for 48 hours — right-concept-wrong-setting: observation with close follow-up is an AAP option only for non-severe AOM; a temperature ≥39°C marks severe AOM, which warrants immediate antibiotic therapy.
Additional high-yield points
If there is recent amoxicillin use, treatment failure, or concomitant conjunctivitis (suggesting beta-lactamase-producing H. influenzae), step up to amoxicillin-clavulanate.
Penicillin-allergic alternatives: cefdinir or cefuroxime; azithromycin is last resort.
Observation with assured follow-up is an option for children ≥2 years with non-severe AOM (mild otalgia for less than 48 hours and temperature below 39°C), whether unilateral or bilateral.
Question 2EENTMedium
A 10-year-old boy is brought to the clinic in July with 2 days of right ear pain and a sensation of fullness. He reports no fever or cold symptoms. He is on a summer swim team and practices in an outdoor pool most afternoons. On exam, gentle traction on the pinna reproduces his pain, and the external auditory canal is erythematous and edematous with scant white debris; the tympanic membrane cannot be visualized. Which of the following is the strongest risk factor for this condition?
AFrequent swimming in pool water
BCleaning ears with cotton swabs
CSeborrheic dermatitis of the ear
DFrequent use of in-ear earbuds
Reveal answer & full explanation
Correct answer: A — Frequent swimming in pool water
AFrequent swimming in pool water✓
BCleaning ears with cotton swabs
CSeborrheic dermatitis of the ear
DFrequent use of in-ear earbuds
Why Frequent swimming in pool water is correct
This is acute otitis externa (swimmer's ear): pinna/tragal tenderness plus an erythematous, debris-filled canal, classically in a summer swimmer.
Repeated water exposure is the single strongest, best-established risk factor. It washes out and disrupts the protective acidic cerumen layer, raising canal pH and humidity and allowing overgrowth of Pseudomonas aeruginosa and Staphylococcus aureus.
This is why the condition is called swimmer's ear and why dry-ear precautions and acidifying drops are advised to prevent recurrence.
Why the others are wrong
Cleaning ears with cotton swabs - cotton-tipped applicators cause local trauma and strip cerumen, so they are a real but weaker risk factor than ongoing water exposure.
Seborrheic dermatitis of the ear - dermatologic conditions of the canal such as seborrheic dermatitis, eczema, or psoriasis disrupt the skin barrier and are recognized predisposing factors, but they are much less common contributors than repeated water exposure, and nothing in this history suggests a chronic dermatosis.
Frequent use of in-ear earbuds - earbuds and hearing aids can cause local trauma and trap moisture, contributing some risk, but far less than the repeated water immersion seen in a competitive swimmer.
Additional high-yield points
A recent upper respiratory illness predisposes to acute otitis MEDIA through eustachian tube dysfunction, not to otitis externa; this boy has no fever or cold symptoms, and pain on pinna traction localizes the problem to the external canal.
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Acute middle ear infection with effusion and signs of inflammation, most common in young children.
Acute inflammation of the external auditory canal, usually bacterial, often associated with water exposure.
Classic presentation
Bulging, opacified TM with impaired mobility on pneumatic otoscopy in a febrile child with otalgia.; Ear pain (otalgia) — pulling/tugging at ear in preverbal children; Fever, irritability, poor feeding, disrupted sleep; Preceding URI symptoms (rhinorrhea, cough); Hearing loss; otorrhea if TM has perforated; In older children/adults:…
Pain with tragal/pinna manipulation plus erythematous, debris-filled canal.; Ear pain, often severe and out of proportion to visible findings; Pruritus (especially fungal); Sensation of fullness or hearing loss from canal swelling; Otorrhea — purulent, scant, or watery; Tenderness on tragal pressure or pinna traction — classic…
Workup / key labs
AAP 2013: (1) Moderate-to-severe bulging of TM or new-onset otorrhea not due to otitis externa, OR (2) mild bulging with recent (<48 h) onset of ear pain or intense erythema of TM. Middle ear effusion must be present.; AOM is a clinical diagnosis; laboratory testing is rarely needed; Tympanocentesis with culture reserved for treatment…
AAO-HNS 2014: rapid onset (≤48 h) within last 3 weeks PLUS symptoms of ear canal inflammation (otalgia, itching, fullness) PLUS signs of canal inflammation (tenderness of tragus/pinna OR diffuse canal edema/erythema).; Clinical diagnosis; cultures rarely needed in uncomplicated AOE; Culture if treatment failure, recurrent,…
Imaging
Pneumatic otoscopy or tympanometry — confirms middle ear effusion when otoscopy ambiguous; CT temporal bone if mastoiditis, intracranial complication, or cholesteatoma suspected
Not routinely needed for uncomplicated AOE; CT temporal bone with contrast or technetium-99m bone scan if malignant OE suspected (bony erosion, skull base osteomyelitis); MRI with gadolinium to evaluate intracranial extension
First-line treatment
Amoxicillin 80-90 mg/kg/day divided BID × 10 days if <2 y or severe (7 days if 2-5 y and non-severe; 5-7 days if ≥6 y and non-severe) — preferred if no amoxicillin in prior 30 days, no concurrent purulent conjunctivitis, and no history of recurrent AOM unresponsive to amoxicillin; Amoxicillin-clavulanate 90 mg/kg/day amoxicillin…
Topical otic antibiotic — ofloxacin 0.3%, ciprofloxacin/dexamethasone, or neomycin/polymyxin B/hydrocortisone × 7-10 days; Use fluoroquinolone-containing drops (ofloxacin or ciprofloxacin) if TM perforation or tympanostomy tubes present — neomycin and aminoglycosides are ototoxic; Aural toilet (gentle suction/curettage under direct…
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