Pericarditis refers to inflammation of the pericardium The pericardium is a sac within which the heart sits. This sac has 2 layers- known as the visceral and parietal layers separated by a potential space which contains about 10-50mls of fluid. Acute inflammation of this sac is known as acute pericarditis. If the inflammation spreads to the surface of the heart itself, it is termed myopericarditis [...]