[Thoracic nocardiosis].

Nocardiosis is an opportunistic infection which occurs mostly in immunocompromised individuals. Pulmonary presentation is the most frequent; however it can affect other parts of the body. Antibiotic treatment is usually prolonged to avoid relapses. The authors present a case report of a patient under prolonged immunosuppressive therapy for psoriatic arthritis, with complaints of right chest pain with one month of evolution.