Definitions for "Pericardial effusion"
build up of fluid within the pericardial sac (the sac which lines the heart and large valves)
Abnormal accumulation of fluid in the pericardial sac.
Fluid collects in the pericardial sac - the outer covering of the heart. It may place pressure on the heart causing it to pump ineffectively. This fluid can be drawn off by using a needle or by taking diuretics.