Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show interval resolution of linear atelectasis previously seen in the left lung base on ___ with improved visualization of the left hemidiaphragm . Blunting of the right costophrenic angle without evidence of pleural effusion on the corresponding lateral radiograph is likely due to pleural thickening or atelectasis . The lungs are otherwise clear without focal consolidation or pneumothorax . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits and unchanged from the preceding radiograph . The pulmonary vasculature is not engorged . Partial resection of the right posterior fourth rib is unchanged . Segmental narrowing of the lower trachea may be related to prior surgery .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Resolved atelectasis of the left lung base from ___ .