Mastoiditis Diagnosis and Management

Systemic and Local Symptoms

Systemic symptoms of mastoiditis include fever, malaise, and headache, according to the American College of Radiology 1
Classic symptoms of mastoiditis include postauricular swelling, erythema or tenderness, protrusion of the auricle, fever, ear pain, and ear discharge, often accompanied by signs of middle ear infection, as recommended by the American College of Radiology 1

Early/uncomplicated mastoiditis often follows acute otitis media, presenting with a reddened and bulging tympanic membrane, ear pain, and conductive hearing loss, as noted by the American College of Radiology 1
Complications of mastoiditis include intracranial extension, venous sinus thrombosis, facial nerve paralysis, and septicemia, as reported by the American College of Radiology 2
Risk factors for complications include young age (children and adolescents), immunocompromised status, delayed treatment, and infection with virulent organisms, as identified by the American Academy of Otolaryngology-Head and Neck Surgery 3

High-resolution temporal bone CT scan with contrast is the first-line imaging modality to assess bone destruction, identify complications, and guide surgical planning, as recommended by the American College of Radiology 1, 4
MRI with contrast is a complementary imaging technique recommended when intracranial complications are suspected, as it is superior for detecting intracranial complications, better characterizes soft tissue extension, and evaluates venous sinus thrombosis, according to the American College of Radiology 1, 2, 5
Cerebral magnetic resonance imaging with diffusion and T1 sequences with and without gadolinium is the preferred imaging modality for diagnosis, based on Clinical Microbiology and Infection guidelines 6
Computed tomography with contrast is recommended if MRI is not available, as suggested by Clinical Microbiology and Infection 6

First-line antibiotic options for uncomplicated mastoiditis include cloxacillin/flucloxacillin IV, ceftriaxone IV, vancomycin plus piperacillin-tazobactam, vancomycin plus a carbapenem, or vancomycin plus ceftriaxone and metronidazole, as suggested by the British Journal of Pharmacology and the American Academy of Otolaryngology-Head and Neck Surgery 3, 7, 8, 9
High-dose amoxicillin-clavulanate (80-90 mg/kg/day of amoxicillin component) is a recommended antibiotic option for uncomplicated otitis media with mastoid opacification, as suggested by the American Academy of Pediatrics 10
For penicillin-allergic patients, clindamycin (10-20 mg/kg/day in 3 divided doses for children; 300-450 mg 3 times daily for adults) may be considered as an alternative antibiotic option, as recommended by the Infectious Diseases Society of America 11
Empirical antibiotic treatment for brain abscesses due to otomastoiditis is a third-generation cephalosporin (such as cefotaxime or ceftriaxone, considering ceftazidime if there's a risk of Pseudomonas infection) combined with metronidazole intravenously for 6-8 weeks, as suggested by Clinical Microbiology and Infection guidelines 6
Total antibiotic therapy (IV + oral) typically lasts 2-3 weeks, with oral therapy continuing for at least 7-10 days after IV therapy completion, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery [3, @3@, 8]

Mastoidectomy is a common surgical intervention, performed in up to 77% of cases, and is considered for patients who do not improve after 48 hours of IV antibiotics, or those with complications such as subperiosteal abscess or intracranial complications [@4@, 3, 12]
Subperiosteal abscess drainage should be performed when present, as recommended by the American College of Radiology 12
Neurosurgical aspiration or excision of the brain abscess is strongly recommended as soon as possible in all patients when feasible, according to Clinical Microbiology and Infection guidelines 6
Specific indications for surgical intervention include lack of response to 48 hours of intravenous antibiotics, presence of a subperiosteal abscess, evidence of bone erosion/coalescence, and development of intracranial complications, based on Clinical Microbiology and Infection recommendations 6

Recurrence rates of approximately 4-8% have been reported, with S. pneumoniae infections having a higher recurrence risk, highlighting the importance of adequate antibiotic coverage and duration of therapy, as reported by the American Academy of Otolaryngology-Head and Neck Surgery 3
Prior antibiotic treatment for AOM does not reliably prevent mastoiditis, with studies showing 33-81% of patients diagnosed with acute mastoiditis had received antibiotics prior to admission, highlighting the need for close monitoring and aggressive treatment, as reported by the American Academy of Otolaryngology-Head and Neck Surgery [@2@, 3]
Close follow-up is essential to monitor for potential complications, and patients should be reassessed within 48-72 hours of starting antibiotics, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 3