A rare, aggressive (fast-growing) type of B-cell non-Hodgkin lymphoma marked by an abnormal build-up of fluids in a body cavity. It usually occurs together with a human herpesvirus or Epstein-Barr virus in people who have weakened immune systems, such as in patients with HIV disease.
( PRY-mayr-ee eh-FYOO-zhun lim-FOH-muh )
Source: NCI Dictionary of Cancer Terms
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