The passage of ﬂuid through the walls of a blood vessel into a tissue or body cavity. It commonly occurs as a result of inﬂammation or damage to the blood vessel. A pleural eﬀusion may occur in heart failure (as a result of increased blood pressure in the veins forcing out ﬂuid) or as a result of inﬂammation in the lung tissue (PNEUMONIA). Eﬀusions may also develop in damaged joints.
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