A case of mycobacterium infection developed in a lung cyst

Abstract

A 61-year-old male with a large lung cyst in the right middle lung field was being followed since the cyst was detected at group screening. In 2004, chest Xp revealed nodule in the right middle lung with disappearance of the cyst. The nodule was suspected to be lung cancer, and right upper lobectomy was performed. Microscopic findings showed necrotic tissue and epithelioid cell granulomas along the cyst wall. The nodule was diagnosed as mycobacterium infection. There are several reports of lung cysts, but it is difficult to diagnose lung cancer with lung cysts before an operation have been performed. Therefore, it is important that the lung cyst be followed carefully a long period of time.