Flashcards in infections of CNS - brain abscess Deck (9)
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1
most common source of bacterial brain abscess
- pulmonary pathology, particularly bronchiectasis
- cyanotic congenital heart disease
- arteriovenous malformations
2
why are congenital heart and vascular issues risk factors for brain abscess?
tend to shunt directly into left side of heart and miss filtration by pulmonary macrophage system
3
typical quality of bacteria that cause brain abscess
anaerobic or microaerobic (from bowel)
4
when are aerobic bacteria involved in brain abscess
- usually when directly connected to sinuses, middle ear, skull fractures
5
most like locations for hematologically spread abscesses
- areas of ischemic injury
6
locations of abscesses based on origin
ear infection - middle third of temporal lobe, cerebellum
sinuses and dental infections - frontal lobe
hematological - any location, often multiple
7
describe first stage of brain abscess and treatment
- cerebritis
- febrile, still active primary infection
- inflammation, tissue breakdown
- raised intracranial pressure
- abnormalities on imaging but no defined mass on angiography
- antibiotics alone can often resolve it
8
describe second stage of brain abscess and treatment
- cerebritis walls off and becomes true abscess
- afrebrile
- expanding mass
- surgical drainage may be needed
9
