Lung cancer associated with cystic airspaces: Characteristic morphological features on CT in a series of 11 cases.

•Lung cancers associated with cystic –airspaces may appear as simple lung cysts, lung cysts with slightly irregular walls or characteristic multicystic bubbly air spaces with internal complete and incomplete septations.•Development of ground-glass change, diffuse wall nodularity, eccentric nodule or increasing complexity within a cystic airspace are indicators of malignancy. These indicators should prompt cancer workup including biopsy.•Lung cancers associated with cystic airspaces are more commonly adenocarcinomas on pathology.•Association with emphysema and smoking is common.•These are slow growing tumors and hence long-term follow-up of cystic airspaces is required.