FIGURE 3.

Cyst-related primary lung malignancies do not always conform to a specific subtype. A chest radiograph in an 82-year-old male showed an incidental finding, which on computed tomography imaging proved to be a cyst-related lung lesion. The lesion does not easily conform to one of the suggested subtypes as it is more bipartite. Flurodeoxyglucose-positron emission tomography computed tomography showed activity and growth was observed over 6 months despite antibiotic therapy. Stereotactic radiotherapy was performed without pathological confirmation of malignancy.