[A case of acute pericarditis secondary to mediastinitis].

A 45-year-old man who complained of swallowing disturbance and chest pain in inspiration phase was admitted for evaluation of "pericarditis". A chest X-ray film on admission disclosed a wide mediastinal shadow and pleural effusion on the right side. Bilateral tonsils were swollen, and covered with pus. A Computed tomogram of the chest showed a shadow of exudate contained with air in the mediastinum. Mediastinal drainage, tonsillectomy and drainage of fistula from pre-tracheal space to upper mediastinum were immediately performed. Staphylococcus aureus was confirmed from the sputum and mediastinal effusion. Thus, acute mediastinitis was confirmed as an etiological diagnosis of "pericarditis" in this patient.