Encephalitis is rare in the United
States; about 20,000 cases are reported every year.1
Outbreaks can occur, causing the number of cases
to be much higher, but these are uncommon in the U.S. But in 2002, an
outbreak of mosquito-borne West Nile virus in the U.S. caused numerous
infections and deaths. Still, far more people who have
West Nile virus develop mild or no symptoms rather
Once a pituitary tumor has been diagnosed, tests are done to find out if it has spread within the central nervous system (brain and spinal cord) or to other parts of the body.
The extent or spread of cancer is usually described as stages. There is no standard staging system for pituitary tumors. Once a pituitary tumor is found, tests are done to find out if the tumor has spread into the brain or to other parts of the body. The following test may be used:
MRI (magnetic resonance imaging):...
The number of cases caused by mosquito-borne
viruses varies by location throughout the world. In the U.S.,
mosquito-borne encephalitis (such as St. Louis encephalitis, La Crosse
encephalitis, and West Nile encephalitis) is rare. Tick-borne viral
encephalitis is even rarer.
Infection with the
rabies virus can cause encephalitis and is almost
always fatal if it is not treated before symptoms develop.
Roos KL, Tyler KL (2008). Meningitis, encephalitis,
brain abscess, and empyema. In AS Fauci et al., eds, Harrison's Principles of Internal Medicine, 17th ed., vol. 2, pp. 2621–2641. New
Primary Medical Reviewer
E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
October 26, 2011
WebMD Medical Reference from Healthwise
October 26, 2011
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