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Brain abscess (or cerebral abscess) is an abscess within the brain tissue 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.
MRI is sensitive for the detection of brain abscess. [25] A number of different imaging modalities or sequences can be used with imaging the nervous system: T 1-weighted (T1W) images: Cerebrospinal fluid is dark. T 1-weighted images are useful for visualizing normal anatomy. T 2-weighted (T2W) images: CSF is light, but fat (and thus white ...
MRI scans produce more detailed images of bodily structures, particularly soft tissues including the brain, [13] and are better at detecting CNS metastases than CT scans. However, CT scans are sometimes used for the initial imaging modality due to their lower cost and efficiency in screening for multiple conditions.
A brain metastasis is a cancer that has metastasized (spread) to the brain from another location in the body and is therefore considered a secondary brain tumor. [ 1 ] [ 2 ] The metastasis typically shares a cancer cell type with the original site of the cancer. [ 3 ]
MRI with contrast enhancement is the preferred imaging test in the diagnosis of brain tumors. [24] [43] Glioblastomas usually enhance with contrast on T1 MRI weighted MRI imaging, and on T2 with FLAIR imaging showing hyperintense cerebral edema. [24] Low grade gliomas are usually hypointense on T1 MRI, and hyperintense with T2 with FLAIR MRI.
In more serious cases, the infection can spread to the mastoid bone behind the ear and possibly to the brain. However, keep in mind that these brain complications are "extremely rare," Olivero says.
A ring-enhancing lesion is an abnormal radiologic sign on MRI or CT scans obtained using radiocontrast. On the image, there is an area of decreased density (see radiodensity) surrounded by a bright rim from concentration of the enhancing contrast dye. This enhancement may represent breakdown of the blood-brain barrier and the development of an ...
A: T2-weighted MRI showing multiple necrotic brain abscesses as a result of a Balamuthia mandrillaris infection. B: T1-weighted MRI showing expansion of the brain infection 4 days later Granulomatous amoebic encephalitis ( GAE ) [ 2 ] is a rare, often fatal, subacute-to-chronic central nervous system disease caused by certain species of free ...