Brain abscess (or cerebral abscess) is an abscess caused by inflammation and collection of infected material, coming from local (ear infection, dental abscess, infection of paranasal sinuses, infection of the mastoid air cells of the temporal bone, epidural abscess) or remote (lung, heart, kidney etc.) infectious sources, within the brain tissue. The infection may also be introduced through a skull fracture following a head trauma or surgical procedures. Brain abscess is usually associated with congenital heart disease in young children. It may occur at any age but is most frequent in the third decade of life.
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http://www.hindawi.com/journals/crii/2015/374956/ norair adjamian, adeline kikam, kathryn ruda wessell, et al., “nocardia brain abscess and cd4+lymphocytopenia in a previously healthy individual,” case reports in immunology, vol. 2015, article id 374956, 3 pages, 2015. Doi:10.1155/2015/374956
http://www.hindawi.com/journals/crii/2015/341898/ soheyla alyasin, reza amin, alireza teymoori, hamidreza houshmand, gholamreza houshmand, and mohammad bahadoram, “brain abscess and keratoacanthoma suggestive of hyper ige syndrome,” case reports in immunology, vol. 2015, article id 341898, 5 pages, 2015. Doi:10.1155/2015/341898