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What is pericarditis?
The heart muscle has a tight covering that surrounds it, a lining sac called the pericardium (peri=around +cardium=heart). This sac actually has two layers. The visceral pericardium is only one cell layer thick and fits tightly onto the heart muscle. The parietal pericardium is much tougher and thicker and has fibers that tether the heart to the rib cage and diaphragm. There is a potential space between the layers, meaning that in normal situations, it has a minimal amount of fluid. However, should inflammation occur, it can fill with fluid. Inflammation of the lining of the heart is called pericarditis (itis=inflammation).