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Definition of Pericardial effusion

Pericardial effusion: Too much fluid within the pericardium, the fibrous sac that surrounds the heart. The pericardium normally contains a small amount of pale yellow fluid which acts as a lubricant, allowing the heart to move within the chest.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4832
Last Editorial Review: 6/9/2003

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