Fig. 1 & 2: Axial CT images (at mid portion of the lungs and lung bases) of a 50-year-old man with dry cough and dyspnea for 2-3 months show multiple cystic airspaces with irregular walls (arrows) and small nodule (arrowhead), predominantly in the upper and mid lung zones sparing the lung bases.
- Emphysema - no perceptible cyst wall, smoking
- LCH (or eosinophilic granuloma) - smoking
- LAM (lymphangiomyomatosis) - evenly distributed cysts, young reproductive women
- Cystic bronchiectasis - cystic spaces can be traced up and down, and connected to the bronchi