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19 yr male: headache, vomiting

Primary brain tumor

Metastases

Cerebral infarction

Septic/ aseptic

Resolving hematoma

Thrombosed aneurysm

Tumefactive MS

Local

Sinusitis

streptococcus/staphylococcus/ bacteriodes

Otitis media/ mastoiditis

Bacteroides/ streptococcus/ enterobacter

Trauma

Congenital malformations

Blood borne

Suppurative lung infection

Bronchiectasis/abscess/ empyema

Immune deficient

IV drug abusers

Multiple ring- enhancing lesions

Commonly affects basal ganglia and subcortical white matter