Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which leads to bronchovascular crowding . There is atelectasis at the left lung base . The cardiac silhouette is unchanged . There is tortuosity of the descending aorta . No pleural effusion or pneumothorax is identified . There is mild irregularity of the cortical margin of the left ___ posterolateral rib . No acute fracture is seen . On an old CXR from ___ a slight irregularity of the cortical margin was also seen . This might represent an old healed rib fracture .
    OUTPUT:
    
Low lung volumes without focal consolidation . No pneumothorax . Stable appearance of the mediastinum . ? Old rib fracture on left . Recommend clinical correlation .