Chronic pericarditis is usually associated with chronic inflammation and may result in fluid around the heart (pericardial effusion).

CNN: Pericarditis

Is the buzz of the Ammiano write-in candidacy anything more than the latest effusion of the activists who have dreamed by the Bay for decades?

ECONOMIST: The San Francisco mayor��s race

It said Mr Mandela had developed a pleural effusion - excess fluid in the lungs which had been drained to enable him to breathe more easily.

BBC: Nelson Mandela breathing without difficulty - presidency