Referring to the pericardium, the sac of fibrous tissue that
surrounds the heart. The inner surface of the pericardium
is lined by a layer of flat cells (mesothelial cells). The pericardial sac
normally contains a
small amount of fluid which acts as a lubricant to allow
normal heart
movement
within the chest. A pericardial effusion refers to the
presence of too much
pericardial fluid, a serous fluid of a pale yellow color,
within the
pericardium.
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