Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperexpanded with early findings of COPD . There is a rounded relative hyperlucency projecting over the left lateral mid lung field , which likely corresponds to a thin - walled cyst on the PET - CT of ___ . There are coarse interstitial lung markings predominantly in the bilateral lung bases . There is no focal consolidation concerning for pneumonia , pleural effusion or pneumothorax . The cardiac silhouette is top normal in size . A density projecting over the left heart on the frontal view with no correlate on the lateral view likely represents a dense costochondral calcification . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
1 . Findings compatible with COPD with mild pulmonary interstitial edema . 2 . No acute cardiopulmonary process .