Bacterial pericarditis caused by infected trichilemmal cyst.

Bacterial pericarditis is a well-known although rare complication of Staphylococcus aureus infection in modern practice. We present a rare case of Staphylococcus pericarditis caused by an infected trichilemmal cyst present on patient's scalp. Our case emphasizes that all cases of bacterial pericarditis should be thoroughly investigated for a source of infection. Constrictive changes can be seen in the pericardium postinfection, as in our patient, and should be treated aggressively. To our knowledge, a case of an infected cyst causing bacterial pericarditis has never been reported previously in the literature.