title: Microbiology of intracranial abscesses associated with sinusitis of odontogenic origin.
abstract: OBJECTIVE
  The unique microbiology of sinusitis of dental origin that is associated with intracranial abscesses (IAs) and the correlation between the organisms at the two sites has not been reported before. This report describes the author's experience during a 30-year period in studying the microbiology of 8 IAs and their corresponding sinusitis of dental origin.
  
  
  METHODS
  Aspirates of pus from 8 infected sinuses associated with odontogenic infections and their corresponding IAs were studied for aerobic and anaerobic bacteria. Polymicrobial flora was found in all 8 sinuses and 7 IAs, and the number of isolates varied from 1 to 5.
  
  
  RESULTS
  Anaerobic bacteria were isolated from all sinuses and IAs. A total of 28 isolates (3.5 isolates per site; 25 strict anaerobic, 1 aerobic or facultative, and 2 microaerophilic) were recovered from the sinuses, and 20 isolates (2.5 isolates per site; 16 strict anaerobic, 1 aerobic or facultative, and 3 microaerophilic) were found in the IAs. The bacterial isolates were Fusobacterium spp (14), Prevotella spp (11), Peptostreptococcus spp (13), microaerophilic streptococci (5), Veillonella parvula (3), and beta-hemolytic streptococci group F(2). Concordance in the microbiological findings between the sinus and the IA was found in all instances; however, certain organisms were only present at one site.
  
  
  CONCLUSIONS
  These data illustrate the concordance in the organisms recovered from sinusitis of dental origin and their associated IAs and confirm the importance of anaerobic bacteria in sinusitis and IAs of dental origin.
authors.affiliation: Department of Pediatrics, Georgetown University School of Medicine, Washington, DC, USA.
authors.forename: Itzhak
authors.initials: I
authors.lastname: Brook
mesh_terms: D000328:Adult; D001922:Brain Abscess / Q000382:microbiology*; D002648:Child; D005260:Female; D005491:Focal Infection, Dental / Q000150:complications*; D006089:Gram-Negative Anaerobic Bacteria / Q000302:isolation & purification; D006095:Gram-Positive Cocci / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008875:Middle Aged; D012852:Sinusitis / Q000209:etiology / Q000382:microbiology*