Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were provided . The lungs are well expanded . There is no focal consolidation , pleural effusion or pneumothorax . Minimal linear opacities at the left lung base are likely atelectasis . The cardiomediastinal silhouette is mildly enlarged . The aortic arch is calcified . The bones are demineralized . There is no definite fracture . The imaged upper abdomen is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process . Mild left lower lobe atelectasis .