Year : 2012 | Volume
: 4 | Issue : 6 | Page : 249-
Pyogenic brain abscess
Venkatesh S Madhugiri
Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry, India
Venkatesh S Madhugiri
Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry-605006
|How to cite this article:|
Madhugiri VS. Pyogenic brain abscess.North Am J Med Sci 2012;4:249-249
|How to cite this URL:|
Madhugiri VS. Pyogenic brain abscess. North Am J Med Sci [serial online] 2012 [cited 2019 Dec 14 ];4:249-249
Available from: http://www.najms.org/text.asp?2012/4/6/249/97201
In this issue, Drs Somsri Wiwanitkit and Viroj Wiwanitkit present a review of brain abscess in Thailand. The authors reiterate the common etiologic factors for brain abscess, otitis, and cyanotic cardiac anomalies. Sinusitis and trauma are common causes elsewhere in the world. Thailand, according to the authors, continues to grapple with a rising incidence of HIV infection. The incidence of brain abscess in HIV-infected individuals is reported to be 3.2%. It is important to know the bacteriology of brain abscesses in HIV-infected patients in Thailand. Uncommon pathogens, such as fungi, Toxoplasma, and Pseudomonas, may be encountered in patients with HIV infection. ,
Streptococcus, Staphylococcus, and Proteus are the most commonly documented bacteria in Thailand. All the streptococcal infections seem to have been in the pediatric age group, but the source of cerebral infection is not clear. The source of infection determines the causative organism -if sinusitis or otitis were the source of infection. Streptococcus is the usual cause, in the setting of bacterial endocarditis, Streptococcus viridans or Staphylococcus may be encountered, and Staphylococcus aureus is responsible for most posttraumatic abscesses.  27.4% of brain abscesses are cryptogenic.  Bacterial cultures may be negative in 33-45% of patients. 
Mortality rates remain as high as 16% for posterior fossa abscess and 10-15% for supratentorial abscess.  The mortality rate in Thailand would need to be compared with these rates.
In a large series reported by Nathoo et al., in 2011, 90% of the abscesses were supratentorial. The most common causes were otitis and trauma. The mortality rate was 13.4%. Factors predictive of poor outcome included infarcts, ventriculitis, poor sensorium, hydrocephalus, bilateral or multiple abscesses, HIV co-infection, and so on.  Other factors predicting poor outcomes in children include burr hole aspiration as the primary procedure and a volume of >20 mL for cerebral abscesses. 
Meliodoisis, amebiasis, and typhoid are uncommon causes of brain abscess elsewhere in the world. The authors are correct to highlight these rare causes of brain abscess.
Despite better sanitation and antimicrobial therapy, brain abscess continues to be an important infection across the world. The reasons, as the authors highlight, could be the increased frequency of travel and the HIV pandemic.
As an initial report from a tropical country, this report adds to the literature on the subject. The major limitation appears to be the data available from the reports recruited for this analysis. This underscores the importance of meticulous record keeping in medical research.
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