FIGURE 10.

Highly suspected cyst-related lung lesion that proved to be of non-malignant aetiology. a) An irregular thick-walled cystic airspace in the right middle lobe of a 60-year-old female. The lesion was initially interpreted as a cavitating malignancy, presumably squamous cell carcinoma. Flurodeoxyglucose-positron emission tomography computed tomography (not shown) showed slight activity which was used to strengthen the suspicion for lung cancer. b) However, a pre-operative computed tomography scan showed decrease of the solid component, which changed the differential diagnosis towards infection. c) The decrease in wall thickness continued on serial imaging over a period of 8 months. The underlying microorganism remained unknown.