Potentially serious: If the fluid is in the (intact) sac surrounding the heart, the buildup can cause a pressure driven cut off to blood trying to get back to the heart (tamponade) and cause cardiovascular collapse and death. This can be alleviated by intervention (needle aspiration or open pericardiectomy or window), but the underlying cause dictates the eventual prognosis. Physical exam & echocardiography critical.
Answered 8/28/2013
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