Localized pericarditis with calcifications mimicking a pericardial tumor

A 62-year-old man was admitted with increasing palpitations. Radiography of the chest demonstrated a calcified mass, Magnetic resonance imaging reveal ed compression of the right ventricle by a tumor. At the time of cardiac ca theterization, the coronary arteries were found not to supply blood flow of the mass, and no dip-and-plateau pattern was seen in the right ventricular pressure measurements. At the time of surgery, the mass was found to be a focal calcified thickening of the pericardium containing only pus. The thic kening resembled an oval pericardial tumor, Microbiologic examination of th e pus revealed Propionibacterium acnes.