ENT · Otology
The facts most likely to be tested
Live insects in the external auditory canal must be immobilized with mineral oil or lidocaine before any attempt at removal.
Button batteries in the ear are a surgical emergency requiring immediate removal to prevent liquefactive necrosis and tympanic membrane perforation.
Spherical foreign bodies (like beads) are best removed using a right-angle hook or curette rather than forceps, which may push the object deeper.
Irrigation is strictly contraindicated for organic foreign bodies like seeds or beans because they can absorb water and expand, causing further impaction.
Direct visualization with an otoscope or microscope is the gold standard for diagnosis and guiding the removal technique.
Alligator forceps are the preferred instrument for grasping soft, irregular objects like paper or cotton.
Asymptomatic patients with a small, inert foreign body may be monitored, but symptomatic patients require urgent removal to prevent otitis externa.
Vignette unlocked
A 4-year-old boy is brought to the urgent care clinic by his mother after he complained of a 'tickling' sensation in his right ear while playing in the backyard. On physical examination, the child is restless and pulling at his ear. Otoscopy reveals a moving, dark object within the external auditory canal. The tympanic membrane is intact and visualized behind the object.
What is the most appropriate initial step in the management of this patient?
Instillation of mineral oil or lidocaine into the ear canal
This vignette tests the management of a live insect, which must be immobilized with mineral oil or lidocaine to stop movement and prevent patient distress before mechanical removal.
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Etiology / Epidemiology
Most common in pediatric patients due to curiosity or developmental delay. Objects include beads, food, or live insects.
Clinical Manifestations
Presentation ranges from asymptomatic to otalgia, otorrhea, or hearing loss. Live insects cause intense distress and movement.
Diagnosis
Diagnosis is via otoscopy. Visualization of the object is the gold standard for confirmation.
Treatment
Removal via forceps, hook, or irrigation. Do not irrigate if the object is organic or a battery.
Prognosis
Excellent with successful removal. Tympanic membrane perforation is the primary complication.
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Epidemiology & Etiology
Predominantly affects children under age 6. Common objects include small toys, beads, and food items. Live insects are a distinct category requiring immediate immobilization.
Pertinent Anatomy
The external auditory canal (EAC) is narrow and sensitive. The isthmus is the narrowest point, where objects often become lodged.
Pathophysiology
Foreign bodies cause mechanical obstruction leading to conductive hearing loss. Organic matter may swell, increasing pressure and risk of infection.
Clinical Manifestations
Patients present with otalgia, pruritus, or a sensation of fullness. Live insects cause audible buzzing and severe pain. Red flags include purulent discharge, fever, or facial nerve palsy suggesting secondary otitis externa or mastoiditis.
Diagnosis
Direct visualization via otoscopy is the gold standard. If the object is not visualized, the diagnosis is unlikely. Use a binocular microscope for better depth perception in difficult cases.
Treatment
Removal techniques include alligator forceps, right-angle hooks, or suction. Do not irrigate organic matter (seeds/beans) as they swell, or button batteries due to risk of liquefactive necrosis. Live insects must be immobilized with lidocaine or mineral oil before extraction.
Prognosis
Most cases resolve without sequelae. Tympanic membrane perforation and canal lacerations are the most common complications. Follow-up is required if the canal wall is traumatized to prevent otitis externa.
Differential Diagnosis
Otitis externa: diffuse canal inflammation without a discrete object
Cerumen impaction: brown/yellow wax obscuring the TM
Otitis media: TM bulging or erythema without canal obstruction
Cholesteatoma: keratin debris and chronic drainage
EAC neoplasm: firm, fixed mass rather than a mobile foreign body