Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is rotated to the left . There is no focal airspace opacity to suggest pneumonia . Left retrocardiac opacity has improved since the prior study with some residual atelectasis at the left base . There is no focal airspace opacity to suggest pneumonia . Moderate cardiomegaly is unchanged . Apparent widening of the mediastinum is likely due to patient rotation . There is no large pleural effusion or pneumothorax . Left chest wall pacemaker has leads terminating in the right atrium and right ventricle . Mid thoracic compression deformities are similar to prior studies . Although chest radiographs have limited sensitivity for rib fracture , no definite displaced fracture is detected .
    OUTPUT:
    
Patient is rotated to the left . No evidence of acute cardiopulmonary abnormality . Although chest radiographs have limited sensitivity for rib fractures , no displaced fracture is detected .