Female, Age 63, per doctor's diagnosis based on X-ray: acute exacerbation of COPD. Medicine going on for past 1 month. Yesterday, patient went through HRCT scan film attached. Report Etiology: 1. Mild mosaic attenuation in bilateral lungs. 2. Mild bilateral apical pleural thickening. 3. Pleuro-parenchymal bands in left upper and lower lobe- s/o post infection sequalae. What do these findings mean? Is this serious? Patient is fine. Mild cough only during sleep. Not in day time. Is this COPD or some allergic disease? Thank you for your suggestions.