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Home >Information for Patients > Dictionary Index
Dictionary of Cancer Terms
View in Spanish: Policitemia verdadera
Polycythemia vera (PAH-lee-sy-THEE-mee-uh VAYR-uh)
A disease in which there are too many red blood cells in the bone marrow and blood, causing the blood to thicken. The number of white blood cells and platelets may also increase. The extra blood cells may collect in the spleen and cause it to become enlarged. They may also cause bleeding problems and make clots form in blood vessels.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.
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22 S. Greene Street, Baltimore, MD 21201
22 S. Greene Street, Baltimore, MD 21201
