Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are noted . Lung volumes are low . There are bilateral small pleural effusions with bibasilar areas of compressive atelectasis . No convincing signs of pneumonia or CHF . Cardiomediastinal silhouette is stable with mild atherosclerotic calcification along the aortic knob . Bony structures are intact . Mild bony hypertrophy of bilateral AC joints noted .
    OUTPUT:
    
Small bilateral pleural effusions with bibasilar atelectasis . No overt signs of edema or pneumonia .