The authors present a case-review of a patient with a thoracic form of actinomycosis, simulating a „pancoastoid“ lung tumor clinical picture- furthermore, confirmed by a false-positive cytological examination. The disorder was managed by enlarged lobectomy from the right lung, followed by postoperative antibiotic therapy, lege artis. The long-term outcome is very good.

        Key words: actinomycosis – pulmonary actinomycosis