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Actinomyces meyeri brain abscess following dental extraction
  1. U Clancy1,
  2. A Ronayne1,
  3. M B Prentice1,
  4. A Jackson2
  1. 1Cork University Hospital, Cork, Ireland
  2. 2Cork University Hospital/Mercy University Hospital, Cork, Ireland
  1. Correspondence to Dr U Clancy, u.p.clancy{at}


We describe the rare occurrence of an Actinomyces meyeri cerebral abscess in a 55-year-old woman following a dental extraction. This patient presented with a 2-day history of hemisensory loss, hyper-reflexia and retro-orbital headache, 7 days following a dental extraction for apical peridonitis. Neuroimaging showed a large left parietal abscess with surrounding empyema. The patient underwent craniotomy and drainage of the abscess. A. meyeri was cultured. Actinomycosis is a rare cause of cerebral abscess. The A. meyeri subtype is particularly rare, accounting for less than 1% of specimens. This case describes an unusually brief course of the disease, which is usually insidious. Parietal lobe involvement is unusual as cerebral abscesses usually have a predilection for the frontal and temporal regions of the brain. Although there are no randomised trials to guide therapy, current consensus is to use a prolonged course of intravenous antibiotics, followed by 6–12 months of oral therapy.

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