[Thoracal actinomycosis - a diagnostic challenge].

: Actinomycotic infection of the chest structures is rare but can be serious. Diagnosis is difficult, since both culture of the bacterium and pathological investigation require special methods. Investigations therefore usually take many months before the correct treatment can be started. The most common differential diagnosis is a chest malignancy. Treatment is long-term antibiotics. We here present three cases which illustrate the clinical and radiological findings and the diagnostic difficulties.