Coalescent Mastoiditis in a Young Child With Penicillin Allergy
4-year-old boy has 5 days of right acute otitis media. He now has fever 39.2°C, postauricular swelling, and the pinna is pushed forward. The tympanic membrane is bulging and erythematous. He has no facial palsy, neck stiffness, or lethargy. White blood cell count is 19,000/µL. CT shows coalescent mastoiditis with an intact sigmoid sinus and no intracranial abscess. He has a documented rash-only allergy to penicillin. He has never had ear surgery. The family asks whether antibiotics can be given at home because he is playful between fevers. He has received amoxicillin for 3 days without improvement. He is up to date on vaccinations. The family has no travel history.
1. Does he need mastoidectomy now, and what initial management would you recommend?
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He has coalescent acute mastoiditis but no intracranial abscess, facial palsy, or sigmoid sinus thrombosis. I would admit for intravenous antibiotics, obtain blood and middle ear cultures by tympanocentesis or myringotomy, and involve ENT for possible ventilation tube placement. Simple mastoiditis without a subperiosteal abscess often responds to antibiotics plus drainage of the middle ear; cortical mastoidectomy is indicated if there is a subperiosteal abscess, intracranial extension, or failure to improve after 48–72 hours. Because CT shows coalescence, I would have a low threshold for surgery if fever or swelling persists. I would not send him home on oral antibiotics.
2. Choose empiric antibiotics and address the penicillin allergy.
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For a rash-only penicillin allergy, a third-generation cephalosporin such as ceftriaxone is acceptable because cross-reactivity is low. I would give ceftriaxone 50–75 mg/kg/day IV, plus vancomycin if there is concern for resistant pneumococcus or severe infection, and adjust to cultures. If the allergy were anaphylaxis or a severe cutaneous reaction, I would choose clindamycin plus a cephalosporin after allergy consultation, or vancomycin plus ciprofloxacin depending on local resistance. I would not use oral amoxicillin because he has already failed it.
3. What complications would you monitor for, and what follow-up is needed?
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I would monitor for facial nerve palsy, postauricular abscess, sigmoid sinus thrombosis, meningismus, and intracranial spread. Persistent fever beyond 48–72 hours, worsening swelling, or new neurologic signs should prompt repeat imaging and surgical drainage. I would obtain audiometry after resolution because mastoiditis and middle ear effusion can cause conductive hearing loss. I would also review vaccination status and counsel about prompt treatment of future ear infections.